Everett-based Thibeault Development has sold a pair of residential and retail buildings in Boston’s Downtown Crossing for $38.5 million to Boston-based Hoffman Cos..

Thibeault acquired 153 Milk St. in 2011 for $4.5 million and renovated the former class B office building into 26 luxury apartments called the FiDi Lofts.

The 5-story 103 Arch St., which is connected by an atrium to 101 Arch St., was acquired in late 2012 for $2.2 million and converted into 21 luxury apartments called FiDi at Midtown.

Colliers International Boston’s multifamily investment sales team led by Christopher Sower represented the seller. Colliers’ debt placement team led by Jeff Black secured the $19.25 million, cross-collateralized, 20-year fixed-rate loan through Principal Life Insurance Co.

Thibeault Development has been active in the central business district including last year’s acquisition of two buildings at 13-15 and 19 Congress St. which have approvals for conversion into a hotel, condos, retail space and collaborative offices.