Today the flagship location has been restored and is home to Maine College of Art & Design.
Porteous expanded and opened branch locations in Maine, New Hampshire, and Vermont.
In Newington NH, Porteous opened in the Newington Mall (now The Crossings at Fox Run) in a location formerly occupied by Sutherland's, the only branch store of a Lawrence MA-based department store that ceased operations in 1976.
Grant store in Cooks Corner Shopping Center in Brunswick ME had been taken over by JC Penney, but was subsequently closed when the JC Penney store opened at the expanded Maine Mall in South Portland in 1983.
Owned by the Dunlaps Store chain based in Texas in its last years (starting around 1993), and operated as "PMB, Inc.--a Division of Dunlaps", the chain found itself flustered with new competition as many regional and national chains started to open units in Maine, New Hampshire and Vermont communities where Porteous previously had carved out its niche in the mid-market department store business.