For elevator buildings, all units on floors served by the elevator must be accessible. For non-elevator buildings, all ground floor units must be accessible.

Alterations to an existing building must be provided with an accessible path of travel to the specific area of alteration. This includes the primary entrance to the building or facility, toilet or bathing facilities serving the area, drinking fountains, public telephones, and signs.

Yes, per 1134A4.

No, an elevator is not required for a single-story building.

An accessible route must be provided to connect each story and mezzanine in a multi-story building (see exceptions per 11B-206.2.3).

No, a townhouse is not exempt. 

Yes, a lift is required at public swimming pools.

Yes, if it complies with the definition of a carriage unit per LABC 202.

1 in 6 DA parking stalls required by Table 11B-208.3 must be a van stall.