I have built several of the Knights of Dice Sentry City 28 mm range. All would make good models for o scale. The only noticeable issue for me is the door size is a bit small. Windows and overall height work well. The buildings are a nice addition and offer a different look---art deco- that is not so common.
The highway overpass bridge represents well an art deco overpass and can be expanded. The price is also competitive but shipping will elevate costs.
First photo is the rear of the building and the next is the front.
I have a number of their kits and all construct easily with tab and slot. The accessories to these structures are compatible to o scale, including park benches and other street details.
Paul