Great laser-etched brick and concrete block material is available in O, S, HO and N scales from Rail Scale Models ( http://www.rail-scale-models.com)

They also sell ornate windows and doors, freight doors, industrial windows, etc. These are products designed by Walt Gillespie at Rusty Stumps Scale Models.

I've used these in several scratch-built structures, and recommend them.

Mark Charles

Ann Arbor, Mich. USA