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In another sign of increasing investor demand for Class B office buildings in downtown Boston, Boston-based Winhall Cos. has acquired a century-old, 11-story building for $28.25 million.

The seller, CenterSquare Investment Management of Plymouth Meeting, Pennsylvania, acquired Two Liberty Square in December 2012 for $17.6 million.

The latest purchase price works out to nearly $418 per square foot. The 67,609-square-foot building is close to 90 percent leased and contains such tenants as Zipcar, insurer Humana, Arthur J. Gallagher & Co., Copyright Clearance Center and publishing company Brill.

The Class B office market in the downtown area is benefiting from a steady influx of New Economy tenants seeking distinctive workspaces and proximity to public transit. The average direct asking rent for Class B office space in the Financial District was $43.36 per foot at the end of the second quarter, according to a JLL report, up from $38.58 in June 2014.

HFF’s Ben Sayles and Coleman Benedict procured the buyer and Lauren O’Neil arranged acquisition financing from Sun Life Financial.