Unlimited Sotheby's International Realty

What Unlimited Sotheby's International Realty does

Unlimited Sotheby's International Realty is a residential real estate brokerage firm headquartered in Brookline, Massachusetts, founded in 1999. The company operates under the Sotheby's International Realty franchise network and also does business as Gibson Sotheby's International Realty, providing residential property listing and sales services to home buyers and sellers across Massachusetts and New Hampshire.

The firm's core offering is brokerage representation on residential property transactions, with no separate product lines, proprietary technology platforms, or digital products disclosed. Its primary differentiator is the affiliation with the Sotheby's International Realty brand, which provides access to the global luxury real estate network and associated brand recognition in the upper-tier segment of the Greater Boston market. The firm employs 101-250 staff.

The business model is commission-based real estate brokerage, which is standard for the industry and not publicly disclosed in detail. Revenue is generated through transaction commissions on residential sales in Massachusetts and New Hampshire. Customer segmentation is vertical/geographic, targeting MA and NH home buyers and sellers, with no disclosed enterprise or institutional customer relationships.

Name

Unlimited Sotheby's International Realty

Website

https://unlimitedsir.com

Company type

Private

Founded year

1999

Operating status

Operating

Headcount range

101–250 employees

Short description

Unlimited Sotheby's International Realty (dba Gibson Sotheby's International Realty) is a residential real estate brokerage serving home buyers and sellers across Massachusetts and New Hampshire via the Sotheby's International Realty franchise network.

Ownership category

akta.pro rank

Product category

Residential Real Estate Brokerage

NAICS

Offices of Real Estate Agents and Brokers (53121)

SIC

Real Estate Agents & Managers (For Others) (6531)

akta.pro primary industry

Residential Investment Property Brokerage (SFR/Small Multifamily) (BPAJAAAE)

Keywords

• Residential real estate brokerage
• Luxury home sales
• Property listing services
• Buyer representation
• Seller representation

Headquarters

HQ city

Brookline

HQ country

United States

HQ region

North America

Markets served

GTM type

B2C

Offering type

Services

Cost components

Personnel, Marketing or Sales, Operations, Others

Core offering

Unlimited Sotheby's International Realty (also doing business as Gibson Sotheby's International Realty) is a residential real estate brokerage firm offering property listing, marketing, and transactional sales services across Massachusetts and New Hampshire. The firm operates as part of the Sotheby's International Realty franchise network, providing buyer and seller representation for residential properties in the Greater Boston area and broader New England region.

Product overview

Gibson Sotheby's International Realty is a real estate brokerage firm offering residential property listing and sales services across Massachusetts and New Hampshire markets. No detailed product portfolio or individual product names were available in the source data.

Differentiator

Problem solved

Functional benefit

Products and services

• Residential Property Listing and Sales Services

Segments1 record

Ideal customer profiles1 record

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Expansion highlights1 record

Emerging players

• eXp Realty: Cloud-based, agent-centric brokerage with growing New England agent rosters. Competes for agent recruitment and listings in MA/NH using a low-overhead virtual model that pressures traditional brokerage economics.
• Redfin: Tech-enabled residential brokerage active in the Boston metro with a lower-cost, technology-driven model. Competes for the same buyer pool but with a fundamentally different cost structure and consumer-facing platform.

Regional players

• Lila Delman Compass: Luxury brokerage active in the Northeast coastal luxury segment, including Massachusetts and Rhode Island markets. Comparable high-end residential focus with regional concentration rather than national footprint.
• CBRB (Coldwell Banker Residential Brokerage) New England: Regional operating arm of a national franchise focused on New England. Comparable suburban Massachusetts brokerage footprint and franchise model, with deep overlap in the Boston suburbs and southern New Hampshire.

Direct peers

• Engel & Völkers: International luxury real estate franchise that competes head-to-head with Sotheby's in the premium segment. Comparable global referral network, luxury brand positioning, and franchise-driven operating model in Boston and surrounding metros.
• Douglas Elliman: Luxury-leaning residential brokerage expanding across the Northeast and competing in Boston's high-end segment. Comparable luxury focus, agent-driven model, and reliance on premium brand positioning.
• William Raveis Real Estate: Large family-owned Northeast-focused brokerage headquartered in Connecticut with significant Massachusetts presence. Direct peer in the regional luxury and suburban brokerage category with comparable agent-driven model.
• Compass: Tech-forward national residential brokerage with a strong Greater Boston agent base. Directly competes for the same buyer/seller pool in MA and NH, but differentiates via proprietary platform, agent productivity tools, and capital-backed marketing capabilities.
• Coldwell Banker Realty: Major national real estate franchise with deep penetration in suburban Massachusetts and New Hampshire. Closely comparable franchise-driven residential brokerage model with broad agent networks and overlapping luxury suburban segments.

Broad incumbents

• Berkshire Hathaway HomeServices: National residential brokerage franchise with broad suburban and luxury presence in New England. Larger portfolio than the subject company but overlapping customer base in MA and NH.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat3 records

Key risks5 records

Key highlights5 records

Customer concentration

• Xx.com/unlimited_sir
• Facebookfacebook.com/unlimitedsir
• LinkedInlinkedin.com/company/unlimitedsir

Revenue estimate

Valuation estimate

Number of profiles

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 Unlimited Sotheby's International Realty