Condo and Walk-up

Condo noun - One of the dwelling units in a condominium.

Walk-up and condo are semantically related in apartment topic. In some cases you can use "Walk-up" instead a noun "Condo", when it comes to topics like set of rooms for rent.

Walk-up noun - An apartment building without an elevator.

Condo and walk-up are semantically related in apartment topic. You can use "Condo" instead a noun phrase "Walk-up", if it concerns topics such as set of rooms for rent.