1800 MASSACHUSETTS AVENUE CORP: Form 990, tax year 2024

View the entire original 990 at ProPublica ↗

Organization: 1800 MASSACHUSETTS AVENUE CORP (EIN 20-0451177)
Tax period: 2024-01-01 to 2024-12-31
Filed: 2025-11-13
IRS object ID: 202523179349302247
Schema version: 2024v5.2
Source: Download XML · Original 990 at ProPublica

Every field in the e-filed return. Faint text is the IRS element name, for citing.

Return header
Form 990
Schedule D
Schedule J
Schedule O
Schedule R

Return header ReturnHeader

Field	Value	IRS element (for citing)
Return	2025-11-13T08:27:29-06:00	ReturnTs
Tax Period End	2024-12-31	TaxPeriodEndDt

Preparer Firm PreparerFirmGrp

Preparer Firm Name PreparerFirmName

Field	Value	IRS element (for citing)
Business Name Line1	WITHUMSMITHBROWNPC	BusinessNameLine1Txt

Preparer US Address PreparerUSAddress

Field	Value	IRS element (for citing)
Address Line1	1800 TYSONS BLVD SUITE 800	AddressLine1Txt
City	TYSONS	CityNm
State Abbreviation	VA	StateAbbreviationCd
ZIP	22102	ZIPCd

Field	Value	IRS element (for citing)
Return Type	990	ReturnTypeCd
Tax Period Begin	2024-01-01	TaxPeriodBeginDt

Filer Filer

Field	Value	IRS element (for citing)
EIN	200451177	EIN

Business Name BusinessName

Field	Value	IRS element (for citing)
Business Name Line1	1800 MASSACHUSETTS AVENUE CORP	BusinessNameLine1Txt

Field	Value	IRS element (for citing)
In Care Of	% MEGAN SWEENEY CFO	InCareOfNm
Business Name Control	1800	BusinessNameControlTxt
Phone	2027307000	PhoneNum

US Address USAddress

Field	Value	IRS element (for citing)
Address Line1	1800 MASSACHUSETTS AVE NW	AddressLine1Txt
City	WASHINGTON	CityNm
State Abbreviation	DC	StateAbbreviationCd
ZIP	20036	ZIPCd

Business Officer BusinessOfficerGrp

Field	Value	IRS element (for citing)
Person	ARCELIA SAENZ	PersonNm
Person Title	SECRETARY/TREASURER	PersonTitleTxt
Phone	2027307000	PhoneNum
Signature	2025-11-12	SignatureDt
Discuss With Paid Preparer	Yes (true)	DiscussWithPaidPreparerInd

Field	Value	IRS element (for citing)
IRS Responsible Prty Info Curr	Yes (true)	IRSResponsiblePrtyInfoCurrInd

Preparer Person PreparerPersonGrp

Field	Value	IRS element (for citing)
Preparer Person	RICHARD L RUVELSON	PreparerPersonNm
PTIN	P00234075	PTIN
Phone	3012726000	PhoneNum
Preparation	2025-11-12	PreparationDt

Field	Value	IRS element (for citing)
Tax	2024	TaxYr
Build TS	2025-03-06 01:10:19Z	BuildTS

Form 990 IRS990

Field	Value	IRS element (for citing)
Principal Officer	APRIL VERRETT	PrincipalOfficerNm

US Address USAddress

Field	Value	IRS element (for citing)
Address Line1	1800 MASSACHUSETTS AVE NW	AddressLine1Txt
City	WASHINGTON	CityNm
State Abbreviation	DC	StateAbbreviationCd
ZIP	20036	ZIPCd

Field	Value	IRS element (for citing)
Gross Receipts	$9,694,866	GrossReceiptsAmt
Group Return For Affiliates	false	GroupReturnForAffiliatesInd
Organization501c	Yes (X)	Organization501cInd
Website Address	N/A	WebsiteAddressTxt
Type Of Organization Corp	Yes (X)	TypeOfOrganizationCorpInd
Formation	2003	FormationYr
Legal Domicile State	DC	LegalDomicileStateCd
Activity Or Mission	THE CORPORATION IS ORGANIZED TO HOLD TITLE TO REAL ESTATE FOR THE INTERNATIONAL UNION'S HEADQUARTERS BUILDING.	ActivityOrMissionDesc
Voting Members Governing Body	3	VotingMembersGoverningBodyCnt
Voting Members Independent	0	VotingMembersIndependentCnt
Total Employee	0	TotalEmployeeCnt
Total Volunteers	0	TotalVolunteersCnt
Total Gross UBI	$277,371	TotalGrossUBIAmt
Net Unrelated Bus Txbl Incm	$0	NetUnrelatedBusTxblIncmAmt
PY Contributions Grants	$0	PYContributionsGrantsAmt
CY Contributions Grants	$0	CYContributionsGrantsAmt
PY Program Service Revenue	$4,588,512	PYProgramServiceRevenueAmt
CY Program Service Revenue	$4,573,629	CYProgramServiceRevenueAmt
PY Investment Income	$269	PYInvestmentIncomeAmt
CY Investment Income	$38	CYInvestmentIncomeAmt
PY Other Revenue	$972,615	PYOtherRevenueAmt
CY Other Revenue	$1,222,114	CYOtherRevenueAmt
PY Total Revenue	$5,561,396	PYTotalRevenueAmt
CY Total Revenue	$5,795,781	CYTotalRevenueAmt
PY Grants And Similar Paid	$0	PYGrantsAndSimilarPaidAmt
CY Grants And Similar Paid	$0	CYGrantsAndSimilarPaidAmt
PY Benefits Paid To Members	$0	PYBenefitsPaidToMembersAmt
CY Benefits Paid To Members	$0	CYBenefitsPaidToMembersAmt
PY Salaries Comp Emp Bnft Paid	$0	PYSalariesCompEmpBnftPaidAmt
CY Salaries Comp Emp Bnft Paid	$0	CYSalariesCompEmpBnftPaidAmt
PY Total Prof Fndrsng Expns	$0	PYTotalProfFndrsngExpnsAmt
CY Total Prof Fndrsng Expns	$0	CYTotalProfFndrsngExpnsAmt
CY Total Fundraising Expense	$0	CYTotalFundraisingExpenseAmt
PY Other Expenses	$5,373,658	PYOtherExpensesAmt
CY Other Expenses	$5,562,086	CYOtherExpensesAmt
PY Total Expenses	$5,373,658	PYTotalExpensesAmt
CY Total Expenses	$5,562,086	CYTotalExpensesAmt
PY Revenues Less Expenses	$187,738	PYRevenuesLessExpensesAmt
CY Revenues Less Expenses	$233,695	CYRevenuesLessExpensesAmt
Total Assets BOY	$73,623,767	TotalAssetsBOYAmt
Total Assets EOY	$72,266,268	TotalAssetsEOYAmt
Total Liabilities BOY	$34,524,050	TotalLiabilitiesBOYAmt
Total Liabilities EOY	$33,499,250	TotalLiabilitiesEOYAmt
Net Assets Or Fund Balances BOY	$39,099,717	NetAssetsOrFundBalancesBOYAmt
Net Assets Or Fund Balances EOY	$38,767,018	NetAssetsOrFundBalancesEOYAmt
Info In Schedule O Part III	Yes (X)	InfoInScheduleOPartIIIInd
Mission	OPERATING THE HEADQUARTERS BUILDING OF A RELATED EXEMPT ORGANIZATION.	MissionDesc
Significant New Program Srvc	false	SignificantNewProgramSrvcInd
Significant Change	false	SignificantChangeInd
Desc	OPERATING THE HEADQUARTERS BUILDING OF A RELATED EXEMPT ORGANIZATION.	Desc
Described In Section501c3	false	DescribedInSection501c3Ind
Schedule B Required	false	ScheduleBRequiredInd
Political Campaign Acty	false	PoliticalCampaignActyInd
Subject To Proxy Tax	false	SubjectToProxyTaxInd
Donor Advised Fund	false	DonorAdvisedFundInd
Conservation Easements	false	ConservationEasementsInd
Collections Of Art	false	CollectionsOfArtInd
Credit Counseling	false	CreditCounselingInd
Donor Rstr Or Quasi Endowments	false	DonorRstrOrQuasiEndowmentsInd
Report Land Building Equipment	Yes (true)	ReportLandBuildingEquipmentInd
Report Investments Other Sec	false	ReportInvestmentsOtherSecInd
Report Program Related Invst	false	ReportProgramRelatedInvstInd
Report Other Assets	false	ReportOtherAssetsInd
Report Other Liabilities	false	ReportOtherLiabilitiesInd
Include FIN48 Footnote	Yes (true)	IncludeFIN48FootnoteInd
Independent Audit Fincl Stmt	false	IndependentAuditFinclStmtInd
Consolidated Audit Fincl Stmt	Yes (true)	ConsolidatedAuditFinclStmtInd
School Operating	false	SchoolOperatingInd
Foreign Office	false	ForeignOfficeInd
Foreign Activities	false	ForeignActivitiesInd
More Than5000 K To Org	false	MoreThan5000KToOrgInd
More Than5000 K To Individuals	false	MoreThan5000KToIndividualsInd
Professional Fundraising	false	ProfessionalFundraisingInd
Fundraising Activities	false	FundraisingActivitiesInd
Gaming Activities	false	GamingActivitiesInd
Operate Hospital	false	OperateHospitalInd
Grants To Organizations	false	GrantsToOrganizationsInd
Grants To Individuals	false	GrantsToIndividualsInd
Schedule J Required	Yes (true)	ScheduleJRequiredInd
Tax Exempt Bonds	false	TaxExemptBondsInd
Loan Outstanding	false	LoanOutstandingInd
Grant To Related Person	false	GrantToRelatedPersonInd
Business Rln With Org Mem	false	BusinessRlnWithOrgMemInd
Business Rln With Fam Mem	false	BusinessRlnWithFamMemInd
Business Rln With35 Ctrl Ent	false	BusinessRlnWith35CtrlEntInd
Deductible Non Cash Contri	false	DeductibleNonCashContriInd
Deductible Art Contribution	false	DeductibleArtContributionInd
Terminate Operations	false	TerminateOperationsInd
Partial Liquidation	false	PartialLiquidationInd
Disregarded Entity	false	DisregardedEntityInd
Related Entity	Yes (true)	RelatedEntityInd
Related Organization Ctrl Ent	false	RelatedOrganizationCtrlEntInd
Activities Conducted Prtshp	false	ActivitiesConductedPrtshpInd
Schedule O Required	Yes (true)	ScheduleORequiredInd
IRP Document	12	IRPDocumentCnt
IRP Document W2 G	0	IRPDocumentW2GCnt
Backup Wthld Compliance	Yes (true)	BackupWthldComplianceInd
Employee	0	EmployeeCnt
Unrelated Bus Incm Over Limit	Yes (true)	UnrelatedBusIncmOverLimitInd
Form990 T Filed	Yes (true)	Form990TFiledInd
Foreign Financial Account	false	ForeignFinancialAccountInd
Prohibited Tax Shelter Trans	false	ProhibitedTaxShelterTransInd
Taxable Party Notification	false	TaxablePartyNotificationInd
Nondeductible Contributions	false	NondeductibleContributionsInd
Indoor Tanning Services	false	IndoorTanningServicesInd
Subj To Tax Rmnrtn Ex Prcht Pymt	false	SubjToTaxRmnrtnExPrchtPymtInd
Subject To Excs Tax Net Invst Inc	false	SubjectToExcsTaxNetInvstIncInd
Info In Schedule O Part VI	Yes (X)	InfoInScheduleOPartVIInd
Governing Body Voting Members	3	GoverningBodyVotingMembersCnt
Independent Voting Member	0	IndependentVotingMemberCnt
Family Or Business Rln	Yes (true)	FamilyOrBusinessRlnInd
Delegation Of Mgmt Duties	false	DelegationOfMgmtDutiesInd
Change To Org Documents	false	ChangeToOrgDocumentsInd
Material Diversion Or Misuse	false	MaterialDiversionOrMisuseInd
Members Or Stockholders	false	MembersOrStockholdersInd
Election Of Board Members	false	ElectionOfBoardMembersInd
Decisions Subject To Approva	false	DecisionsSubjectToApprovaInd
Minutes Of Governing Body	Yes (true)	MinutesOfGoverningBodyInd
Minutes Of Committees	false	MinutesOfCommitteesInd
Officer Mailing Address	false	OfficerMailingAddressInd
Local Chapters	false	LocalChaptersInd
Form990 Provided To Gvrn Body	Yes (true)	Form990ProvidedToGvrnBodyInd
Conflict Of Interest Policy	false	ConflictOfInterestPolicyInd
Whistleblower Policy	false	WhistleblowerPolicyInd
Document Retention Policy	false	DocumentRetentionPolicyInd
Compensation Process CEO	false	CompensationProcessCEOInd
Compensation Process Other	false	CompensationProcessOtherInd
Investment In Joint Venture	false	InvestmentInJointVentureInd
States Where Copy Of Return Is Fld	DC	StatesWhereCopyOfReturnIsFldCd
Upon Request	Yes (X)	UponRequestInd

Books In Care Of Detail BooksInCareOfDetail

Field	Value	IRS element (for citing)
Person	MEGAN SWEENEY CFO	PersonNm
Phone	2027307685	PhoneNum

US Address USAddress

Field	Value	IRS element (for citing)
Address Line1	1800 MASSACHUSETTS AVENUE NW	AddressLine1Txt
City	WASHINGTON	CityNm
State Abbreviation	DC	StateAbbreviationCd
ZIP	20036	ZIPCd

Field	Value	IRS element (for citing)
Info In Schedule O Part VII	Yes (X)	InfoInScheduleOPartVIIInd

Form990 Part VII Section A Form990PartVIISectionAGrp (4 entries)

TitleTitleTxt	Average Hours Per WeekAverageHoursPerWeekRt	Average Hours Per Week Rltd OrgAverageHoursPerWeekRltdOrgRt	Individual Trustee Or DirectorIndividualTrusteeOrDirectorInd	OfficerOfficerInd	Reportable Comp From OrgReportableCompFromOrgAmt	Reportable Comp From Rltd OrgReportableCompFromRltdOrgAmt	Other CompensationOtherCompensationAmt
APRIL VERRETT
PRESIDENT - EFF. 05/2024	1.0	35.0	Yes (X)	Yes (X)	$0	$277,893	$94,773
ARCELIA SAENZ
SECRETARY/TREASURER	1.0	35.0	Yes (X)	Yes (X)	$0	$249,033	$122,658
MARY KAY HENRY
PRESIDENT - TERM. 05/2024	2.0	35.0	Yes (X)	Yes (X)	$0	$187,998	$167,296
MEGAN SWEENEY
VICE PRESIDENT	1.0	35.0	Yes (X)	Yes (X)	$0	$187,373	$124,466

Field	Value	IRS element (for citing)
Total Reportable Comp From Org	$0	TotalReportableCompFromOrgAmt
Tot Reportable Comp Rltd Org	$902,297	TotReportableCompRltdOrgAmt
Total Other Compensation	$509,193	TotalOtherCompensationAmt
Indiv Rcvd Greater Than100 K	0	IndivRcvdGreaterThan100KCnt
Former Ofcr Employees Listed	false	FormerOfcrEmployeesListedInd
Total Comp Greater Than150 K	Yes (true)	TotalCompGreaterThan150KInd
Compensation From Other Srcs	false	CompensationFromOtherSrcsInd

Contractor Compensation ContractorCompensationGrp (5 entries)

Address Line1ContractorAddress/USAddress/AddressLine1Txt	CityContractorAddress/USAddress/CityNm	State AbbreviationContractorAddress/USAddress/StateAbbreviationCd	ZIPContractorAddress/USAddress/ZIPCd	ServicesServicesDesc	CompensationCompensationAmt
CUSHMAN WAKEFIELD
PO BOX 9296	NEW YORK	NY	100879296	PROPERTY MANAGEMENT	$866,224
RED COATS INC
PO BOX 79579	BALTIMORE	MD	21279	CLEANING SERVICEs	$721,521
INSIGHT CONSTRUCT LLC
1110 NORTH GLEBE ROAD SUITE 300	ARLINGTON	VA	22201	CONSTRUCTION SERVICE	$367,339
WESTERN SPECIALTY CONTRACTORS
9249 9251 HAMPTON OVERLOOK	CAPITOL HEIGHTS	MD	20743	CONSTRUCTION SERVICE	$289,980
ADMIRAL SECURITY SERVICES
PO BOX 79776	BALTIMORE	MD	212790776	SECURITY SERVICES	$276,837

Field	Value	IRS element (for citing)
Cntrct Rcvd Greater Than100 K	9	CntrctRcvdGreaterThan100KCnt
Total Contributions	$0	TotalContributionsAmt

Program Service Revenue ProgramServiceRevenueGrp

Field	Value	IRS element (for citing)
Desc	RENTAL INCOME FROM AFFILIATES	Desc
Business	531120	BusinessCd
Total Revenue Column	$4,573,629	TotalRevenueColumnAmt
Related Or Exempt Func Income	$4,573,629	RelatedOrExemptFuncIncomeAmt

Field	Value	IRS element (for citing)
Total Program Service Revenue	$4,573,629	TotalProgramServiceRevenueAmt

Investment Income InvestmentIncomeGrp

Field	Value	IRS element (for citing)
Total Revenue Column	$38	TotalRevenueColumnAmt
Exclusion	$38	ExclusionAmt

Incm From Invest Bond Proceeds IncmFromInvestBondProceedsGrp

Field	Value	IRS element (for citing)
Total Revenue Column	$0	TotalRevenueColumnAmt

Royalties Revenue RoyaltiesRevenueGrp

Field	Value	IRS element (for citing)
Total Revenue Column	$0	TotalRevenueColumnAmt

Gross Rents GrossRentsGrp

Field	Value	IRS element (for citing)
Real	$4,794,879	RealAmt

Less Rental Expenses LessRentalExpensesGrp

Field	Value	IRS element (for citing)
Real	$3,899,085	RealAmt

Rental Income Or Loss RentalIncomeOrLossGrp

Field	Value	IRS element (for citing)
Real	$895,794	RealAmt
Personal	$0	PersonalAmt

Net Rental Income Or Loss NetRentalIncomeOrLossGrp

Field	Value	IRS element (for citing)
Total Revenue Column	$895,794	TotalRevenueColumnAmt
Unrelated Business Revenue	$227,129	UnrelatedBusinessRevenueAmt
Exclusion	$668,665	ExclusionAmt

Net Gain Or Loss Investments NetGainOrLossInvestmentsGrp

Field	Value	IRS element (for citing)
Total Revenue Column	$0	TotalRevenueColumnAmt

Field	Value	IRS element (for citing)
Fundraising Gross Income	$0	FundraisingGrossIncomeAmt
Fundraising Direct Expenses	$0	FundraisingDirectExpensesAmt

Net Incm From Fundraising Evt NetIncmFromFundraisingEvtGrp

Field	Value	IRS element (for citing)
Total Revenue Column	$0	TotalRevenueColumnAmt

Field	Value	IRS element (for citing)
Gaming Gross Income	$0	GamingGrossIncomeAmt
Gaming Direct Expenses	$0	GamingDirectExpensesAmt

Net Income From Gaming NetIncomeFromGamingGrp

Field	Value	IRS element (for citing)
Total Revenue Column	$0	TotalRevenueColumnAmt

Field	Value	IRS element (for citing)
Gross Sales Of Inventory	$0	GrossSalesOfInventoryAmt
Cost Of Goods Sold	$0	CostOfGoodsSoldAmt

Net Income Or Loss NetIncomeOrLossGrp

Field	Value	IRS element (for citing)
Total Revenue Column	$0	TotalRevenueColumnAmt

Other Revenue Misc OtherRevenueMiscGrp (2 entries)

DescDesc	BusinessBusinessCd	Total Revenue ColumnTotalRevenueColumnAmt	Related Or Exempt Func IncomeRelatedOrExemptFuncIncomeAmt	Unrelated Business RevenueUnrelatedBusinessRevenueAmt	ExclusionExclusionAmt
CONFERENCE SERVICE INCOME	561499	$84,805	$34,563	$50,242
MISCELLANEOUS	900099	$241,515			$241,515

Field	Value	IRS element (for citing)
Other Revenue Total	$326,320	OtherRevenueTotalAmt

Total Revenue TotalRevenueGrp

Field	Value	IRS element (for citing)
Total Revenue Column	$5,795,781	TotalRevenueColumnAmt
Related Or Exempt Func Income	$4,608,192	RelatedOrExemptFuncIncomeAmt
Unrelated Business Revenue	$277,371	UnrelatedBusinessRevenueAmt
Exclusion	$910,218	ExclusionAmt

Grants To Domestic Orgs GrantsToDomesticOrgsGrp

Field	Value	IRS element (for citing)
Total	$0	TotalAmt

Grants To Domestic Individuals GrantsToDomesticIndividualsGrp

Field	Value	IRS element (for citing)
Total	$0	TotalAmt

Foreign Grants ForeignGrantsGrp

Field	Value	IRS element (for citing)
Total	$0	TotalAmt

Benefits To Members BenefitsToMembersGrp

Field	Value	IRS element (for citing)
Total	$0	TotalAmt

Comp Current Ofcr Directors CompCurrentOfcrDirectorsGrp

Field	Value	IRS element (for citing)
Total	$0	TotalAmt

Comp Disqual Persons CompDisqualPersonsGrp

Field	Value	IRS element (for citing)
Total	$0	TotalAmt

Other Salaries And Wages OtherSalariesAndWagesGrp

Field	Value	IRS element (for citing)
Total	$0	TotalAmt

Pension Plan Contributions PensionPlanContributionsGrp

Field	Value	IRS element (for citing)
Total	$0	TotalAmt

Other Employee Benefits OtherEmployeeBenefitsGrp

Field	Value	IRS element (for citing)
Total	$0	TotalAmt

Payroll Taxes PayrollTaxesGrp

Field	Value	IRS element (for citing)
Total	$0	TotalAmt

Fees For Services Management FeesForServicesManagementGrp

Field	Value	IRS element (for citing)
Total	$0	TotalAmt

Fees For Services Legal FeesForServicesLegalGrp

Field	Value	IRS element (for citing)
Total	$0	TotalAmt

Fees For Services Accounting FeesForServicesAccountingGrp

Field	Value	IRS element (for citing)
Total	$0	TotalAmt

Fees For Services Lobbying FeesForServicesLobbyingGrp

Field	Value	IRS element (for citing)
Total	$0	TotalAmt

Fees For Services Prof Fundraising FeesForServicesProfFundraising

Field	Value	IRS element (for citing)
Total	$0	TotalAmt

Fees For Srvc Invst Mgmnt Fees FeesForSrvcInvstMgmntFeesGrp

Field	Value	IRS element (for citing)
Total	$1,435	TotalAmt

Fees For Services Other FeesForServicesOtherGrp

Field	Value	IRS element (for citing)
Total	$0	TotalAmt

Advertising AdvertisingGrp

Field	Value	IRS element (for citing)
Total	$11,090	TotalAmt

Office Expenses OfficeExpensesGrp

Field	Value	IRS element (for citing)
Total	$42,917	TotalAmt

Information Technology InformationTechnologyGrp

Field	Value	IRS element (for citing)
Total	$0	TotalAmt

Royalties RoyaltiesGrp

Field	Value	IRS element (for citing)
Total	$0	TotalAmt

Occupancy OccupancyGrp

Field	Value	IRS element (for citing)
Total	$3,140,047	TotalAmt

Travel TravelGrp

Field	Value	IRS element (for citing)
Total	$0	TotalAmt

Pymt Travel Entrtnmnt Pub Ofcl PymtTravelEntrtnmntPubOfclGrp

Field	Value	IRS element (for citing)
Total	$0	TotalAmt

Conferences Meetings ConferencesMeetingsGrp

Field	Value	IRS element (for citing)
Total	$0	TotalAmt

Interest InterestGrp

Field	Value	IRS element (for citing)
Total	$587,158	TotalAmt

Payments To Affiliates PaymentsToAffiliatesGrp

Field	Value	IRS element (for citing)
Total	$0	TotalAmt

Depreciation Depletion DepreciationDepletionGrp

Field	Value	IRS element (for citing)
Total	$1,676,696	TotalAmt

Insurance InsuranceGrp

Field	Value	IRS element (for citing)
Total	$59,076	TotalAmt

Other Expenses OtherExpensesGrp (2 entries)

DescDesc	TotalTotalAmt
ADMIN SALARIES & PR TAXES	$26,510
MISCELLANEOUS	$17,157

Total Functional Expenses TotalFunctionalExpensesGrp

Field	Value	IRS element (for citing)
Total	$5,562,086	TotalAmt

Cash Non Interest Bearing CashNonInterestBearingGrp

Field	Value	IRS element (for citing)
BOY	$0	BOYAmt
EOY	$0	EOYAmt

Savings And Temp Cash Invst SavingsAndTempCashInvstGrp

Field	Value	IRS element (for citing)
BOY	$3,974,653	BOYAmt
EOY	$4,650,297	EOYAmt

Pledges And Grants Receivable PledgesAndGrantsReceivableGrp

Field	Value	IRS element (for citing)
BOY	$0	BOYAmt
EOY	$0	EOYAmt

Accounts Receivable AccountsReceivableGrp

Field	Value	IRS element (for citing)
BOY	$645,881	BOYAmt
EOY	$623,434	EOYAmt

Receivables From Officers Etc ReceivablesFromOfficersEtcGrp

Field	Value	IRS element (for citing)
BOY	$0	BOYAmt
EOY	$0	EOYAmt

Rcvbl From Disqualified Prsn RcvblFromDisqualifiedPrsnGrp

Field	Value	IRS element (for citing)
BOY	$0	BOYAmt
EOY	$0	EOYAmt

Oth Notes Loans Receivable Net OthNotesLoansReceivableNetGrp

Field	Value	IRS element (for citing)
BOY	$0	BOYAmt
EOY	$0	EOYAmt

Inventories For Sale Or Use InventoriesForSaleOrUseGrp

Field	Value	IRS element (for citing)
BOY	$0	BOYAmt
EOY	$0	EOYAmt

Prepaid Expenses Defrd Charges PrepaidExpensesDefrdChargesGrp

Field	Value	IRS element (for citing)
BOY	$39,862	BOYAmt
EOY	$40,944	EOYAmt

Field	Value	IRS element (for citing)
Land Bldg Equip Cost Or Other Bss	$115,660,097	LandBldgEquipCostOrOtherBssAmt
Land Bldg Equip Accum Deprec	$51,098,992	LandBldgEquipAccumDeprecAmt

Land Bldg Equip Basis Net LandBldgEquipBasisNetGrp

Field	Value	IRS element (for citing)
BOY	$65,711,247	BOYAmt
EOY	$64,561,105	EOYAmt

Investments Pub Traded Sec InvestmentsPubTradedSecGrp

Field	Value	IRS element (for citing)
BOY	$0	BOYAmt
EOY	$0	EOYAmt

Investments Other Securities InvestmentsOtherSecuritiesGrp

Field	Value	IRS element (for citing)
BOY	$0	BOYAmt
EOY	$0	EOYAmt

Investments Program Related InvestmentsProgramRelatedGrp

Field	Value	IRS element (for citing)
BOY	$0	BOYAmt
EOY	$0	EOYAmt

Intangible Assets IntangibleAssetsGrp

Field	Value	IRS element (for citing)
BOY	$0	BOYAmt
EOY	$0	EOYAmt

Other Assets Total OtherAssetsTotalGrp

Field	Value	IRS element (for citing)
BOY	$3,252,124	BOYAmt
EOY	$2,390,488	EOYAmt

Total Assets TotalAssetsGrp

Field	Value	IRS element (for citing)
BOY	$73,623,767	BOYAmt
EOY	$72,266,268	EOYAmt

Accounts Payable Accr Expnss AccountsPayableAccrExpnssGrp

Field	Value	IRS element (for citing)
BOY	$909,793	BOYAmt
EOY	$1,623,932	EOYAmt

Grants Payable GrantsPayableGrp

Field	Value	IRS element (for citing)
BOY	$0	BOYAmt
EOY	$0	EOYAmt

Deferred Revenue DeferredRevenueGrp

Field	Value	IRS element (for citing)
BOY	$551,333	BOYAmt
EOY	$522,246	EOYAmt

Tax Exempt Bond Liabilities TaxExemptBondLiabilitiesGrp

Field	Value	IRS element (for citing)
BOY	$0	BOYAmt
EOY	$0	EOYAmt

Escrow Account Liability EscrowAccountLiabilityGrp

Field	Value	IRS element (for citing)
BOY	$0	BOYAmt
EOY	$0	EOYAmt

Loans From Officers Directors LoansFromOfficersDirectorsGrp

Field	Value	IRS element (for citing)
BOY	$0	BOYAmt
EOY	$0	EOYAmt

Mortg Notes Pybl Scrd Invst Prop MortgNotesPyblScrdInvstPropGrp

Field	Value	IRS element (for citing)
BOY	$0	BOYAmt
EOY	$0	EOYAmt

Unsecured Notes Loans Payable UnsecuredNotesLoansPayableGrp

Field	Value	IRS element (for citing)
BOY	$33,062,924	BOYAmt
EOY	$31,353,072	EOYAmt

Other Liabilities OtherLiabilitiesGrp

Field	Value	IRS element (for citing)
BOY	$0	BOYAmt
EOY	$0	EOYAmt

Total Liabilities TotalLiabilitiesGrp

Field	Value	IRS element (for citing)
BOY	$34,524,050	BOYAmt
EOY	$33,499,250	EOYAmt

Field	Value	IRS element (for citing)
Organization Follows FASB117	Yes (X)	OrganizationFollowsFASB117Ind

No Donor Restriction Net Assets NoDonorRestrictionNetAssetsGrp

Field	Value	IRS element (for citing)
BOY	$39,099,717	BOYAmt
EOY	$38,767,018	EOYAmt

Donor Restriction Net Assets DonorRestrictionNetAssetsGrp

Field	Value	IRS element (for citing)
BOY	$0	BOYAmt
EOY	$0	EOYAmt

Total Net Assets Fund Balance TotalNetAssetsFundBalanceGrp

Field	Value	IRS element (for citing)
BOY	$39,099,717	BOYAmt
EOY	$38,767,018	EOYAmt

Tot Liab Net Assets Fund Balance TotLiabNetAssetsFundBalanceGrp

Field	Value	IRS element (for citing)
BOY	$73,623,767	BOYAmt
EOY	$72,266,268	EOYAmt

Field	Value	IRS element (for citing)
Info In Schedule O Part XI	Yes (X)	InfoInScheduleOPartXIInd
Reconcilation Revenue Expnss	$233,695	ReconcilationRevenueExpnssAmt
Other Changes In Net Assets	-$566,394	OtherChangesInNetAssetsAmt
Method Of Accounting Accrual	Yes (X)	MethodOfAccountingAccrualInd
Accountant Compile Or Review	false	AccountantCompileOrReviewInd
FS Audited	Yes (true)	FSAuditedInd

FS Audited Basis FSAuditedBasisGrp

Field	Value	IRS element (for citing)
Consolidated Basis Fincl Stmt	Yes (X)	ConsolidatedBasisFinclStmtInd

Field	Value	IRS element (for citing)
Audit Committee	Yes (true)	AuditCommitteeInd
Federal Grant Audit Required	false	FederalGrantAuditRequiredInd

Schedule D IRS990ScheduleD

Field	Value	IRS element (for citing)
Art Public Exhibition Amounts		ArtPublicExhibitionAmountsGrp
Held Works Art		HeldWorksArtGrp
CY Minus3 Yr Endwmt Fund		CYMinus3YrEndwmtFundGrp
CY Minus4 Yr Endwmt Fund		CYMinus4YrEndwmtFundGrp

Land LandGrp

Field	Value	IRS element (for citing)
Other Cost Or Other Basis	$18,000,000	OtherCostOrOtherBasisAmt
Book Value	$18,000,000	BookValueAmt

Buildings BuildingsGrp

Field	Value	IRS element (for citing)
Other Cost Or Other Basis	$87,606,548	OtherCostOrOtherBasisAmt
Depreciation	$42,091,728	DepreciationAmt
Book Value	$45,514,820	BookValueAmt

Leasehold Improvements LeaseholdImprovementsGrp

Field	Value	IRS element (for citing)
Other Cost Or Other Basis	$5,055,916	OtherCostOrOtherBasisAmt
Depreciation	$4,033,723	DepreciationAmt
Book Value	$1,022,193	BookValueAmt

Equipment EquipmentGrp

Field	Value	IRS element (for citing)
Other Cost Or Other Basis	$4,960,435	OtherCostOrOtherBasisAmt
Depreciation	$4,957,565	DepreciationAmt
Book Value	$2,870	BookValueAmt

Other Land Buildings OtherLandBuildingsGrp

Field	Value	IRS element (for citing)
Other Cost Or Other Basis	$37,198	OtherCostOrOtherBasisAmt
Depreciation	$15,976	DepreciationAmt
Book Value	$21,222	BookValueAmt

Field	Value	IRS element (for citing)
Total Book Value Land Buildings	$64,561,105	TotalBookValueLandBuildingsAmt
Federal Income Tax Liability	$0	FederalIncomeTaxLiabilityAmt
Total Liability	$0	TotalLiabilityAmt
Footnote Text	Yes (X)	FootnoteTextInd

Supplemental Information Detail SupplementalInformationDetail

Field	Value	IRS element (for citing)
Form And Line Reference	PART X, LINE 2 - FIN 48 FOOTNOTE:	FormAndLineReferenceDesc
Explanation	U.S. GAAP REQUIRES MANAGEMENT TO EVALUATE INCOME TAX POSITIONS TAKEN AND ACCRUE AN INCOME TAX LIABILITY IF THE ORGANIZATION HAS TAKEN AN UNCERTAIN POSITION THAT MORE LIKELY THAN NOT WOULD NOT BE SUSTAINED UPON EXAMINATION BY THE IRS. MANAGEMENT HAS EVALUATED THE INCOME TAX POSITIONS TAKEN AND CONCLUDED THAT AS OF DECEMBER 31, 2024 AND 2023 THERE ARE NO UNCERTAIN POSITIONS TAKEN OR EXPECTED TO BE TAKEN THAT WOULD REQUIRE RECOGNITION IN THE CONSOLIDATED FINANCIAL STATEMENTS. THE GENERAL FUND (US), GENERAL FUND (CANADA), PEA INTERNATIONAL, 1800 MASS, COPE AND UNITED WE CAN ARE SUBJECT TO ROUTINE AUDITS BY TAXING JURISDICTIONS; HOWEVER, THERE ARE CURRENTLY NO AUDITS IN PROGRESS FOR ANY TAX PERIODS. IN ADDITION, THERE HAVE BEEN NO TAX RELATED INTEREST OR PENALTIES FOR THE PERIODS PRESENTED IN THESE CONSOLIDATED FINANCIAL STATEMENTS. SHOULD SUCH PENALTIES AND INTEREST BE INCURRED, MANAGEMENT'S POLICY WOULD BE TO RECOGNIZE THEM AS ADMINISTRATIVE EXPENSES.	ExplanationTxt

Schedule J IRS990ScheduleJ

Field	Value	IRS element (for citing)
Severance Payment	Yes (true)	SeverancePaymentInd
Supplemental Nonqual Rtr Plan	false	SupplementalNonqualRtrPlanInd
Equity Based Comp Arrngm	false	EquityBasedCompArrngmInd

Rltd Org Officer Trst Key Empl RltdOrgOfficerTrstKeyEmplGrp (4 entries)

TitleTitleTxt	Base Compensation Filing OrgBaseCompensationFilingOrgAmt	Compensation Based On Rltd OrgsCompensationBasedOnRltdOrgsAmt	Bonus Filing OrganizationBonusFilingOrganizationAmount	Bonus Related OrganizationsBonusRelatedOrganizationsAmt	Other Compensation Filing OrgOtherCompensationFilingOrgAmt	Other Compensation Rltd OrgsOtherCompensationRltdOrgsAmt	Deferred Compensation Flng OrgDeferredCompensationFlngOrgAmt	Deferred Comp Rltd OrgsDeferredCompRltdOrgsAmt	Nontaxable Benefits Filing OrgNontaxableBenefitsFilingOrgAmt	Nontaxable Benefits Rltd OrgsNontaxableBenefitsRltdOrgsAmt	Total Compensation Filing OrgTotalCompensationFilingOrgAmt	Total Compensation Rltd OrgsTotalCompensationRltdOrgsAmt	Comp Report Prior990 Filing OrgCompReportPrior990FilingOrgAmt	Comp Report Prior990 Rltd OrgsCompReportPrior990RltdOrgsAmt
MARY KAY HENRY
PRESIDENT - TERM. 05/2024	$0	$187,533	$0	$0	$0	$465	$0	$134,840	$0	$32,456	$0	$355,294	$0	$0
MEGAN SWEENEY
VICE PRESIDENT	$0	$181,953	$0	$5,420	$0	$0	$0	$92,348	$0	$32,118	$0	$311,839	$0	$0
APRIL VERRETT
PRESIDENT - EFF. 05/2024	$0	$277,893	$0	$0	$0	$0	$0	$75,127	$0	$19,646	$0	$372,666	$0	$0
ARCELIA SAENZ
SECRETARY/TREASURER	$0	$249,033	$0	$0	$0	$0	$0	$90,180	$0	$32,478	$0	$371,691	$0	$0

Supplemental Information Detail SupplementalInformationDetail (2 entries)

Form And Line ReferenceFormAndLineReferenceDesc	ExplanationExplanationTxt
PART I, LINE 3 - METHOD FOR ESTABLISHING COMPENSATION:	THE TOP MANAGEMENT OFFICIAL IS UNCOMPENSATED BY THE REPORTING ORGANIZATION. THE REPORTING ORGANIZATION RELIES ON A RELATED ORGANIZATION (SEIU) TO ESTABLISH THE COMPENSATION FOR THE TOP MANAGEMENT OFFICIAL. SEIU uses comparable data, an independent compensation consultant and approval by the compensation committee & board in its process of establishing officers compensation.
PART I, LINE 4A: SEVERANCE PAYMENT	In 2024, Mary Kay Henry received a severance payment of $33,118, which was reported as taxable income on her 2024 W-2 form from Service Employees International Union.

Schedule O IRS990ScheduleO

Supplemental Information Detail SupplementalInformationDetail (6 entries)

Form And Line ReferenceFormAndLineReferenceDesc	ExplanationExplanationTxt
PART VI, SECTION A, LINE 2 - BUSINESS RELATIONSHIPS:	MARY KAY HENRY, MEGAN SWEENEY, ARCELIA SAENZ, AND APRIL VERRETT HAVE A BUSINESS RELATIONSHIP THROUGH SERVICE EMPLOYEES' INTERNATIONAL UNION.
PART VI, SECTION A, LINE 8B - OTHER COMMITTEES:	THE ENTITY DOES NOT HAVE OTHER COMMITTEES WITH AUTHORITY TO ACT ON ITS BEHALF OUTSIDE OF THE GOVERNING BODY.
PART VI, SECTION B, LINE 11B - FORM 990 REVIEW:	THE FEDERAL FORM 990 IS PREPARED BY AN INDEPENDENT ACCOUNTING FIRM. PRIOR TO ITS FILING, THE FORM IS PRESENTED TO THE BOARD OF DIRECTORS FOR THEIR REVIEW OF THE CONTENT WITHIN THE FORM 990.
PART VI, SECTION B, LINES 12 - 14 - GOVERNING POLICIES:	1800 MASSACHUSETTS AVENUE CORPORATION DOES NOT HAVE ITS OWN SEPARATELY WRITTEN DEFINED POLICIES AND PROCEDURES, ITS OFFICERS ARE COVERED UNDER THE GOVERNING POLICIES OF THE SERVICE EMPLOYERS INTERNATIONAL UNION (SEIU) AS THE ORPORATION IS THE TITLE HOLDING COMPANY ON SEIU'S BEHALF OF ITS HEADQUARTERS. THE CORPORATION'S OFFICERS FOLLOW SEIU'S CONFLICT OF INTEREST, WHISTLEBLOWER AND DOCUMENT RETENTION POLICIES.
PART VI, SECTION C, LINE 19 - PUBLIC ACCESS TO DOCUMENTS:	THE ORGANIZATION DOES NOT MAKE AVAILABLE TO THE PUBLIC ITS GOVERNING DOCUMENTS, POLICIES AND FINANCIAL STATEMENTS.
PART XI, LINE 9 - CHANGE IN NET ASSETS:	GAAP DEFERRED RENTAL INCOME $ (566,394)

Schedule R IRS990ScheduleR

Id Related Tax Exempt Org IdRelatedTaxExemptOrgGrp (5 entries)

Address Line1USAddress/AddressLine1Txt	CityUSAddress/CityNm	State AbbreviationUSAddress/StateAbbreviationCd	ZIPUSAddress/ZIPCd	EINEIN	Primary ActivitiesPrimaryActivitiesTxt	Legal Domicile StateLegalDomicileStateCd	Exempt Code SectionExemptCodeSectionTxt	Business Name Line1DirectControllingEntityName/BusinessNameLine1Txt	Controlled OrganizationControlledOrganizationInd	Direct Controlling NADirectControllingNACd
SEIU COMMITTEE ON POLITICAL EDUCATION
1800 MASSACHUSETSS AVENUE NW	WASHINGTON	DC	20036	200859683	POLITICAL ORG	DC	527	SEIU	false
SERVICE EMPLOYEES INTERNATIONAL UNION
1800 MASSACHUSETTS AVENUE NW	WASHINGTON	DC	20036	360852885	LABOR ORG	DC	501(C)(5)		false	N/A
UNITED WE CAN
1800 MASSACHUSETTS AVENUE NW	WASHINGTON	DC	20036	475491558	POLITICAL ORG	DC	527	SEIU	false
UNITED WE CAN MICHIGAN
1800 MASSACHUSETTS AVENUE NW	WASHINGTON	DC	20036	830647866	POLITICAL ORG	DC	527	SEIU	false
SEIU POLITICAL EDUCATION AND ACTION FUND
1800 MASSACHUSETTS AVENUE NW	WASHINGTON	DC	20036	522263644	POLITICAL ORG	DC	527	SEIU	false

Field	Value	IRS element (for citing)
Receipt Of Int Annts Rnts Rylts	false	ReceiptOfIntAnntsRntsRyltsInd
Gift Grnt Or Cap Contri To Oth Org	false	GiftGrntOrCapContriToOthOrgInd
Gift Grnt Cap Contri From Oth Org	false	GiftGrntCapContriFromOthOrgInd
Loans Or Guarantees To Other Org	false	LoansOrGuaranteesToOtherOrgInd
Loans Or Guarantees From Oth Org	false	LoansOrGuaranteesFromOthOrgInd
Div Related Organization	false	DivRelatedOrganizationInd
Asset Sale To Other Org	false	AssetSaleToOtherOrgInd
Asset Purchase From Other Org	false	AssetPurchaseFromOtherOrgInd
Asset Exchange	false	AssetExchangeInd
Rental Of Facilities To Oth Org	Yes (true)	RentalOfFacilitiesToOthOrgInd
Rental Of Fclts From Oth Org	false	RentalOfFcltsFromOthOrgInd
Perform Of Services For Oth Org	false	PerformOfServicesForOthOrgInd
Perform Of Services By Other Org	false	PerformOfServicesByOtherOrgInd
Sharing Of Facilities	Yes (true)	SharingOfFacilitiesInd
Paid Employees Sharing	Yes (true)	PaidEmployeesSharingInd
Reimbursement Paid To Other Org	false	ReimbursementPaidToOtherOrgInd
Reimbursement Paid By Other Org	false	ReimbursementPaidByOtherOrgInd
Transfer To Other Org	false	TransferToOtherOrgInd
Transfer From Other Org	Yes (true)	TransferFromOtherOrgInd