Here are a few photos of a background "flat" that I worked on over the holidays. It is kitbashed from three Atlas City Litho flats. It's ready for me to weather and scenic.
The vents and air conditioner are HO scale Walthers details. But they look good in O. The water tank is Ameri-Town with custom made decal. The tall smoke stack is also an HO Walthers detail. Roof covering is typical tar and stone roof using Woodland Scenics fine grey ballast.
I added wood bumpers to the docks, exteriors light fixtures (non-working), and hand rails to steps. The concrete slabs are Plaster of Paris stained with Model Master aged concrete paint. I also added interior lighting.
Before and after shot of adding mortar line to brick.