Response to comment:
"I've done this work before, I'd roughly estimate that adding one unisex restroom will cost something just over $100,000 and they may loose seating"
1. (ADA does not require you to provide a restroom in resturaunts, they also do not require you to lose income generating seating in existing resturaunts with non-compliant restrooms) "If provided" it must comply (they can be deleted if not required by local codes, but doing so inconviences "all" patrons). Provison requirements are based on local codes.
(if they asked me I'd bring in my architect who is knowledgeable about ADA and work with him and the owner to see if it is at all possible to expand the employees' restroom
2. If less than (15?) employees, accessible employeee bathrooms are not required (but RRs for employees are required by health codes) but a mistake not to do so in the event a disabled employee is hired.
3. Existing small resturants with liquor licenses can be an issue as many health codes require both a urinal and a WC in the mens room. I have found many of these lacking in clear floor space. If the mens room is a single occupant, some agencies will allow removal of the urinal. thereby providing the required clear floor space. Each existing facility must be reviewed on a site by site basis, there is no "one size fits all" answer. Within reason barrier removal can be addressd for far less than you indicate.
in their back kitchen/store room, but they will loose something important there too even if it is possible). They are located in a small strip mall and Handicap Parking is not near the doors, and is certainly inadequate with no van spaces. BTW, they do have many disabled customers on a daily basis, probably because they are near a large retirement community, to my knowledge nobody has complained or sued. To tear out and jackhammer out floors they will have to shut down for a couple of weeks, on the other hand I've remodeled restaurants where they wanted to stay open and I've worked at night paying time and a half, it does cost a lot more but may restaurants have thought the extra cost was worth it not to shut down (I've priced it both ways). The center owner is a large real estate development company with many complexes, there are several other restaurants in this strip mall sharing the limited parking, I think their biggest financial hit will/would be the loss of parking to all businesses in the center.