Exterior and interior architectural detailing. Common features include high-ceilings, hardwood floors, arched doorways or fireplaces. Most are co-ops. Exteriors are usually white, red or brown brick. Most are cheaper than prewar.
Laundry facilities are usually in the basement.
No elevator or doorman. Originally built as multi-family housing. There are usually more apartments in this type of housing than in a brownstone. This is one of the cheapest apartment options. Originally built as tenements.