Windsor Management

What Windsor Management does

Windsor Management Corporation is a privately held, family-owned commercial real estate company founded in 1944 and headquartered in New York City. The firm owns and manages a portfolio of 10 Class A office buildings totaling more than 950,000 rentable square feet across three established Northeast markets — Manhattan (Midtown South), Rye in Westchester County, New York, and Shelton, Connecticut. Assets include full-floor and small-office product, including the Kiamie Arcade, which reportedly comprises approximately 60 individual small offices targeted at smaller tenants. The business serves a tenant mix spanning SMBs, mid-market firms, enterprise users, and suburban corporate occupiers, leasing space through a broker network that includes NGKF, CBRE, and Newmark, and increasingly via the VTS digital marketplace.

The company's revenue model is structurally simple: recurring rental income from owned Class A office product, supplemented by property management services for the portfolio. The firm has no proprietary technology platform — its sole digital surface is its use of the VTS marketplace for listing available space, which extends broker reach beyond traditional off-market channels. Capital is continuously reinvested into the existing portfolio through capital improvement programs intended to preserve Class A positioning and support rental rate uplift. Tenant relationships and broker relationships are managed directly by the Kiamie family, with the second generation (Matt Kiamie as President/CEO and Phillip Kiamie Jr. as Vice President) now leading day-to-day operations while founders Don and Phillip Kiamie Sr. serve in Chairman Emeritus and Vice Chairman Emeritus roles.

Operationally, the firm is small — disclosed headcount of 11–50 employees — consistent with a lean, owner-operator model. Under Matt Kiamie's tenure, the portfolio has expanded by approximately 400,000 square feet, indicating selective, accretive acquisitions of Class A assets in established submarkets. The firm added operational capacity in 2024 with the hires of Irene Noble and Sofia Noble. There is no disclosed external funding, no public M&A pipeline beyond ongoing asset-level acquisitions, and no announced geographic expansion beyond New York and Connecticut. The combination of long-duration family ownership, submarket concentration in supply-constrained Northeast locations, and absence of proprietary technology characterizes Windsor as a stable, traditional CRE owner-operator rather than a technology-enabled real estate platform.

Name

Windsor Management

Legal name

Windsor Management Corporation

Website

https://windsormngt.com

Company type

Private

Founded year

1944

Operating status

Operating

Headcount range

11–50 employees

Short description

Windsor Management is a family-owned, NYC-based commercial real estate firm founded in 1944 that owns and operates 10 Class A office buildings totaling 950,000+ square feet across Manhattan, Westchester, and Connecticut, leasing to SMB, mid-market, and enterprise tenants.

Ownership category

akta.pro rank

Product category

Commercial Real Estate Property Management

NAICS

Nonresidential Property Managers (531312), Real Estate Property Managers (53131)

SIC

Operators Of Nonresidential Buildings (6512), Real Estate (6500)

akta.pro primary industry

Office Property Management (BPAJAGAA)

akta.pro secondary industry

Office Real Estate Asset Management (BPAJAMAG)

Keywords

• Commercial real estate
• Property management
• Office leasing
• Tenant services
• Class A offices

Headquarters

HQ city

New York

HQ country

United States

HQ region

North America

Offices11 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Operations, Personnel, Infrastructure, Marketing or Sales

Revenue model

1. Commercial Office Leasing: Revenue generated from leasing office space to tenants across the portfolio of commercial properties in Manhattan, Westchester, and Connecticut.
2. Property Management Services: Full-service property management providing hands-on approach to property operations, maintenance, and tenant services.

Go-to-market motion2 records

Distribution channels2 records

Marketing channels1 record

Core offering

Windsor Management is a privately held, full-service commercial real estate company that owns, leases, and manages a portfolio of 10 Class A office buildings totaling over 950,000 rentable square feet across Midtown South Manhattan, Westchester (Rye, NY), and Connecticut (Shelton). The company provides hands-on property management, leasing through broker relationships and the VTS marketplace, and ongoing tenant services including property upgrades and capital improvements.

Product overview

Windsor Management is a privately held, full-service commercial real estate company offering a portfolio of ten Class A office buildings across Manhattan, Westchester, and Connecticut. The portfolio comprises over 950,000 rentable square feet of commercial office space. Properties include 99 Madison Avenue (17-story, 130,000 SF fully renovated building), 44 East 32nd Street and 31 East 32nd Street (12-story Midtown South buildings), 118 East 28th Street/Kiamie Arcade (flexible small-office building with ~60 units), 16 West 36th Street (13-story, 67,272 SF), 37 West 26th Street (historic Flatiron District building from 1908), 256 West 36th Street (Class A boutique with full-floor identity options), 115 West 45th Street (12-story 1925 boutique near Broadway), 6 Armstrong Road Shelton CT (164,000 SF suburban campus), and 411 Theodore Fremd Avenue Rye NY (118,658 SF Class A Westchester building). The company provides hands-on property management, leasing, and tenant services for this diversified portfolio.

Differentiator

Problem solved

Functional benefit

Products and services

• 99 Madison Avenue A fully renovated 17-story Class A commercial office building in Midtown South Manhattan (Nomad) with 8,300 SF floor plates, renovated lobby, high ceilings, glass offices, phone booths, luxury pantries, and architectural LED fixtures; leased to mid-market and enterprise tenants.
• 44 East 32nd Street A 12-story, 91,111 SF Class A office building in Midtown South Manhattan between Park Avenue South and Madison Avenues, home to the Cutting Room music venue at street level; leased through NGKF and GFPRE brokers.
• 31 East 32nd Street A 12-story, 71,916 SF Class A office building with 5,532 SF typical floor sizes in Midtown South Manhattan; serves as Windsor Management's headquarters.
• 118 East 28th Street (Kiamie Arcade) A commercial office building offering nearly 60 separate offices ranging from 400 to 5,500 SF with short-term lease options, targeted at startups and smaller businesses seeking flexible office space.
• 16 West 36th Street A 13-story, 67,272 SF Class A office building in Midtown South Manhattan off the corner of 5th Avenue, located near major transportation hubs.
• 37 West 26th Street A historic 11-story commercial office building built in 1908 in Manhattan's Flatiron District, featuring 11,275 SF floors, vaulted ceilings, and a renovated marble lobby.
• 256 West 36th Street A premier Class A, 12-story, 36,500 SF commercial office building with versatile floor plates ranging from 2,200 SF to 3,500 SF offering full-floor identity options.
• 115 West 45th Street A 12-story boutique commercial office building with a classic 1925 exterior facade in Manhattan's theater district near Broadway.
• 6 Armstrong Road, Shelton CT A 164,000 SF Class A office property in Shelton, Connecticut off Route 8, with renovated entrances, luxury cafe, high-tech fitness center, and a 3.5-acre pond with walking/jogging trails.
• 411 Theodore Fremd Avenue, Rye NY (Kiamie 411) A 118,658 SF Class A office building in Rye, New York featuring a state-of-the-art fitness center, hourly train shuttle service, renovated cafe, and landscaped gardens.
• Full-Service Property Management Hands-on property management, maintenance, capital improvements, and ongoing tenant services provided across the Windsor Management portfolio.
• Commercial Office Leasing Leasing of Class A commercial office space to tenants across the Windsor portfolio, handled directly and through established broker relationships with firms including NGKF, GFPRE, Savitt Partners, CBRE, and Lee & Associates.

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Scale indicators5 records

Recent moves6 records

Expansion highlights4 records

Broad incumbents

• CBRE Group: World's largest commercial real estate services firm offering property management, leasing, and investment sales. Comparable service line to Windsor's property management and leasing functions, though CBRE is a global agency/management platform rather than an owner-operator.
• Vornado Realty Trust: Large publicly traded NYC-focused office REIT concentrated in Penn Plaza and Midtown Manhattan. Comparable NYC Class A office exposure but at significantly larger scale and with a public-company governance and capital structure.
• JLL (Jones Lang LaSalle): Global commercial real estate services and investment management firm offering property management, leasing, and advisory. Comparable on property management services delivery, but at much greater scale and as a third-party manager rather than a principal.
• Newmark Group: Commercial real estate advisory and services firm (formerly Newmark Knight Frank) with significant NYC leasing and property management presence — already a broker partner on Windsor properties. Comparable services overlap but operates as an agency rather than an owner.
• SL Green Realty Corp: Largest publicly traded NYC-focused office REIT with a Manhattan-centric portfolio of Class A office assets. Comparable product type and submarket to Windsor but at much greater scale, public-company capital structure, and institutional management.
• Empire State Realty Trust: Publicly traded REIT owning the Empire State Building and a portfolio of Manhattan and Westchester Class A office properties. Particularly relevant Westchester overlap with Windsor's Rye asset, though ESRT operates at far greater scale and with public-market capital.

Direct peers

• The Durst Organization: Family-owned, privately held NYC commercial real estate developer and operator behind major Class A office towers including One Bryant Park and One World Trade Center. Comparable to Windsor in structure (private family ownership) and product type (NYC Class A office) but at vastly greater scale.
• Rudin Management Company: Family-owned NYC commercial real estate owner and operator with a portfolio of office and residential properties across Manhattan. Highly comparable to Windsor as a multi-generational, vertically integrated NYC office landlord focused on Class A product and tenant relationships.
• Tishman Speyer: Global private real estate owner/developer/operator with deep NYC Class A office portfolio (Rockefeller Center, 11 Madison). Comparable to Windsor on product type and NYC office focus; Windsor's CFO previously served at Tishman Speyer, indicating direct labor-market overlap and operational parallels.
• RFR Realty: Privately held NYC-based commercial real estate investor and operator with a portfolio of Class A office and mixed-use assets. Comparable to Windsor as a boutique NYC office owner/operator with active leasing, property management, and tenant services.

Market position

Strengths5 records

Weaknesses4 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

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Revenue estimate

Valuation estimate

Number of profiles

Profiles7 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Windsor Management