This is true in theory but in practice often hard to get approved. For example, in San Francisco you can never apply for a pass through on buildings occupied by

This is true in theory but in practice often hard to get approved. For example, in San Francisco you can never apply for a pass through on buildings occupied by the elderly or disabled even if that tenant sublets to non-protected people. In my experience, pass throughs are a theoretical concession instead of a practical one.