New England Real Estate Journal

Avison Young arranges two full-floor leases at 300 Cambridge St. - now 100% occupied

January 23, 2026 - Brokerage

Boston, MA Global real estate advisor Avison Young arranged two full floor leases at 300 Cambridge St., a 25,010 s/f office building with ground floor retail located in the city’s Beacon Hill submarket, bringing the building to 100% occupancy.

Alpha School, an AI-powered private school, signed a new lease for the entire fourth floor totaling 4,959 s/f. Fathom Information Design, a software company, extended its 4,414 s/f lease for the entire fifth floor.

Avison Young senior vice president Kirk Weller represented the landlord, Heritage Equity, LLC in both leases.

“In less than 12 months after being engaged by ownership to address two potential full-floor vacancies, we successfully identified and secured a new tenant and negotiated a lease extension that stabilized property,” said Weller. “300 Cambridge offers the rare opportunity to be a full-floor tenant in less than 5,000 s/f, which – combined with its prime Beacon Hill location – attracted two high-quality tenants.”

“We appreciate Kirk Weller’s hard work to fully lease 300 Cambridge amidst the evolving office market,” said Chris Talanian of Heritage Equity, LLC. “We are pleased to continue our relationship with Fathom and look forward to supporting Alpha School’s growth in their new space.”