Regularly Occupied Space + Basement View Access

We are doing a zero-lot line project in NYC on a very narrow site. The program is located on 2 floors each with a large performance space located in toward the rear of the lot. This is a 2-part question: 1. Do performance spaces (theatre/ dance studio) or lounges (where people wait for performances) fall under Regularly Occupied Space? Should they be included in the View calculation/ building section if there are no desks? There will be 42" view access and someone will spend 1 hour/ person/ day - with practice/ rehearsals. 2. The basement floor of this building has windows, but the view is partially obstructed by a retaining wall and existing fire stair that is roughly 6'-0" from the window. Views are accessible from 42" to 90" AFF, but the sight line is slim. Let me know your thoughts - thank you very much!