Quadrangle
Quadrangle is a private, family-owned commercial real estate firm that develops, owns, and manages institutional-quality apartments, office buildings, hotels, life science facilities, and mixed-use properties exclusively in the greater Washington, D.C. region.
- Company typePrivate
- Founded1970
- HeadquartersWashington, United States
- Headcount101–250
- GTM typeB2B and B2C
- OfferingServices
What Quadrangle does
Quadrangle is a privately held, family-owned commercial real estate development and ownership firm headquartered at 1001 G Street NW, Suite 900, in Washington, D.C. Founded in 1970, the firm operates exclusively in the greater Washington, D.C. region and has spent more than 50 years developing, acquiring, and managing institutional-quality real estate. Over five decades it has built, acquired, or begun development of more than 63 buildings totaling over 20 million square feet and representing $12 billion at current-dollar cost across apartments, office buildings, hotels, life science and build-to-suit facilities, and mixed-use properties.
The firm operates a vertically integrated platform in which approximately 150 in-house experts execute every stage of the real estate lifecycle — programming, entitlements, design, financing, construction, acquisition, and ongoing property management — eliminating reliance on third-party intermediaries. Featured trophy assets include Lydian Apartments, 1850 Towers Crescent Office, the Marriott Marquis Hotel, One Freedom Plaza (1301 Pennsylvania Avenue NW), Washington Center (1001 G Street NW), and the Key Bridge Marriott. Its customer base spans residential tenants, commercial office tenants (including life science users), and hotel guests, with the Marriott brand serving as a notable hospitality partner.
Quadrangle generates revenue primarily through long-term ownership and operation of its portfolio — recurring rental income from apartments and office buildings, hotel operating income, and management fees — supplemented by development profit and equity returns on new projects. Pricing is project-specific rather than productized, and the firm does not publicly disclose financial terms, revenue, or valuation. Current leadership is held by Christopher Gladstone and Elise Rabekoff, with founder Robert Gladstone serving as Chairman, reflecting a multi-generational family-ownership structure. Distribution is direct, through the firm's own property management and leasing operations, targeting institutional-quality tenants in the Washington metropolitan area.
Quadrangle firmographics
Firmographics- Name
- Quadrangle
- Legal name
- Quadrangle
- Website
- https://quadrangledevcorp.com
- Company type
- Private
- Founded year
- 1970
- Operating status
- Operating
- Headcount range
- 101–250 employees
- Short description
- Quadrangle is a private, family-owned commercial real estate firm that develops, owns, and manages institutional-quality apartments, office buildings, hotels, life science facilities, and mixed-use properties exclusively in the greater Washington, D.C. region.
- Ownership category
- akta.pro rank
Quadrangle industry classification
Industry- NAICS
- Lessors of Nonresidential Buildings (except Miniwarehouses) (53112), Lessors of Residential Buildings and Dwellings (531110), Lessors of Nonresidential Buildings (except Miniwarehouses) (531120)
- SIC
- Real Estate Dealers (For Their Own Account) (6532), Operative Builders (1531), Operators Of Apartment Buildings (6513)
- akta.pro primary industry
- Multifamily (Apartment) Property Management (BPAJAGAD)
- akta.pro secondary industry
- Multi-Family Residential Construction (Apartments, Condos, Townhomes) (IMAFABAB)
Keywords
Where Quadrangle is headquartered
LocationHeadquarters
- HQ city
- Washington
- HQ country
- United States
- HQ region
- North America
Offices1 record
Markets served
Quadrangle business model
Business model- GTM type
- B2B and B2C
- Offering type
- Services
- Cost components
- Personnel, Supply Chain, Operations, Marketing or Sales, Technology or R&D
Revenue model
- Real Estate Development: Development fees and equity returns from building institutional-quality commercial real estate properties including apartments, office buildings, hotels, life science facilities, and mixed-use developments in the Washington, D.C. region.
- Property Ownership and Management: Long-term ownership and management of developed properties generating recurring rental income from tenants in apartments, office buildings, and hotels.
Go-to-market motion1 record
Distribution channels1 record
Marketing channels2 records
Quadrangle product offering
Product offeringCore offering
Quadrangle develops, owns, and operates institutional-quality commercial real estate across multiple asset classes — apartments, office buildings, hotels, life science facilities, and mixed-use properties — exclusively in the greater Washington, D.C. region. The firm runs a vertically integrated in-house platform with 150 experts handling acquisition, development, ownership, leasing, and ongoing management of more than 63 buildings totaling over 20 million square feet.
Product overview
Quadrangle is a vertically integrated commercial real estate development and ownership firm exclusively focused on the greater Washington, D.C. region. The company offers a portfolio of institutional-quality property types including apartments (Lydian Apartments), office buildings (1850 Towers Crescent Office), hotels (Marriott Marquis Hotel), life science facilities, and mixed-use developments. With 150 in-house experts, Quadrangle handles all aspects of the development lifecycle from programming and entitlements through design, financing, construction, acquisition, and property management.
Differentiator
Problem solved
Functional benefit
Products and services
- Lydian Apartments
- 1850 Towers Crescent Office
- Marriott Marquis Hotel
Quantifiable outcome
- Over 63 buildings developed, acquired, or in development with $12 billion at current-dollar cost
Companies that use Quadrangle
Customer profileNamed customers2 records
Segments3 records
Ideal customer profiles3 records
Quadrangle technology and API
TechnologyTechnology focussed No
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Quadrangle partnerships and signals
Strategic signalScale indicators5 records
Recent moves6 records
Expansion highlights5 records
Quadrangle competitors and assessment
Company assessmentDirect peers
- Carr Properties: Privately held Washington D.C.-focused commercial real estate developer and owner of Class-A office and multifamily properties — a near-perfect analog to Quadrangle in scale, geography, and vertically integrated operating approach.
- JBG SMITH Properties: Publicly traded REIT focused exclusively on the Washington D.C. metropolitan area, developing and owning a mixed portfolio of office, multifamily, and mixed-use assets — directly comparable to Quadrangle on geography, asset mix, and development model.
- The Donohoe Companies: Washington D.C. area vertically integrated real estate firm with development, construction, and hospitality operations — comparable to Quadrangle's DC focus and multi-vertical integrated platform including hotels.
- Akridge: Long-standing Washington D.C.-focused private commercial real estate developer and owner of office, multifamily, and mixed-use properties — comparable on exclusive D.C. focus and integrated development/ownership.
Broad incumbents
- Tishman Speyer: Global vertically integrated real estate developer and owner of trophy office, multifamily, and life science assets — comparable to Quadrangle on vertical integration and life science exposure but at global scale.
- Brookfield Property Partners: One of the world's largest commercial real estate owners and developers across office, retail, multifamily, and hospitality — comparable to Quadrangle's diversified asset mix and trophy asset focus, though at vastly larger scale.
- Vornado Realty Trust: Large public REIT with a flagship D.C. office portfolio (including the Skyline complex) alongside NYC assets — comparable to Quadrangle on trophy office ownership and D.C. market exposure but at much greater scale.
- Boston Properties (BXP): One of the largest publicly traded office REITs in the U.S. with significant trophy Class-A office holdings including in the D.C. market — comparable to Quadrangle's institutional-quality office vertical but at national scale.
Regional players
- Saul Centers: DC-area public REIT focused on supermarket-anchored retail and mixed-use properties primarily in the Mid-Atlantic — comparable to Quadrangle on Mid-Atlantic regional focus and mixed-use development.
- Brandywine Realty Trust: Philadelphia-area public REIT focused on Class-A office and mixed-use development in select urban markets — comparable to Quadrangle's regional trophy office strategy though in a different geography.
Market position
Strengths4 records
Weaknesses4 records
Competitive moat5 records
Key risks5 records
Key highlights6 records
Customer concentration
Quadrangle social profiles
Digital presenceQuadrangle financial estimates
Financial estimateRevenue estimate
Valuation estimate
Quadrangle leadership team
Management profileNumber of profiles
Profiles3 records
Quadrangle funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Quadrangle M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Quadrangle
What does Quadrangle do?
Quadrangle develops, owns, and operates institutional-quality commercial real estate across multiple asset classes — apartments, office buildings, hotels, life science facilities, and mixed-use properties — exclusively in the greater Washington, D.C. region. The firm runs a vertically integrated in-house platform with 150 experts handling acquisition, development, ownership, leasing, and ongoing management of more than 63 buildings totaling over 20 million square feet.
Is Quadrangle a public or private company?
Quadrangle is a private company. It is classified as family owned and is currently operating.
When was Quadrangle founded?
Quadrangle was founded in 1970. It employs 101 to 250 people.
Where is Quadrangle based?
Quadrangle is headquartered in Washington, United States, in the North America region.
How does Quadrangle make money?
Two revenue lines are on record. Real Estate Development is the primary driver. The others are property Ownership and Management.
Who are Quadrangle's main competitors?
Direct peers on record are Carr Properties, JBG SMITH Properties, The Donohoe Companies and Akridge. Broad incumbents are Tishman Speyer, Brookfield Property Partners, Vornado Realty Trust and Boston Properties (BXP). Regional players are Saul Centers and Brandywine Realty Trust.
Does Quadrangle have an API?
No public API is recorded for Quadrangle.
What industry is Quadrangle in?
Its primary akta.pro industry code is BPAJAGAD, Multifamily (Apartment) Property Management, with a secondary code of IMAFABAB, Multi-Family Residential Construction (Apartments, Condos, Townhomes). Its NAICS code is 53112 and its SIC code is 6532.