When selecting a space for a therapy practice it's very important to choose one that is soothing and quiet. There should be as few distractions as possible, giving your patient a better chance of focusing on the work. The office should be well decorated as well, with plants, paintings, and other elements that invite a relaxed frame of mind.
That said, you can still choose a room that's undecorated, with the intention of decorating it later. Lofts, apartments, office
meeting rooms, and creative studios can all serve as a space for a therapy session. Inquire about the sound properties before committing to a space, especially a downtown space where traffic noise could be invasive. Many therapy offices offer soundproofing to ensure an intimate feel and a relaxing atmosphere.