Image courtesy of Newmark

A Greenwich real estate investor sold a Boston office property for a 47-percent discount after eight years of ownership, in a reflection of the city’s struggling class B office market.

Brickman Real Estate acquired the 186 Lincoln St. property for $20.65 million in 2015 and sold the 73,000-square-foot office building this week to Boston-based City Realty for $11 million.

The sales price equates to just over $150 per square foot.

The class B and C office market in Boston’s central business district had a 24.9 percent availability rate and a 20.6 percent vacancy rate at the end of the third quarter, according to a recent CBRE report. Since the beginning of the year, the market has nearly 230,000 square feet of negative absorption.

The new owners said they plan to modernize the building, originally completed in 1899, with new tenant amenities including fitness and locker rooms and a game room.

Tenants include CozyKin, SmartSense by Digi, Full Contact Advertising, and Mightier, according to brokerage Newmark which represented the seller and has been named leasing agent. Spaces ranging from 1,500 to 30,000 square feet are available for lease.