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Condition of the lath and plaster? Sometime, its just cheaper to tear it out and drywall over those area instead of patching. Better in the long run, no cracks and easier to manage. I would not tie into exiting line but drain them into the main way down below if possible to eliminate any issues in the future. Its a bit more money up front, but makes life easier without having to deal old metal drain pipes especially if employees and customers will be using the sinks and bathroom. they will flush all kinds of stuff down the toilet. Why do you think restaurants always have a commercial drain snake stash sway in the back room somewhere? If the plumber is taken care of his portion of work, ask the difference on price to have all those floor sinks drain into the main instead of the branch lines. Milt is correct, not too many sinks can be drained into branch lines. There's no approved plans and you are installing floor drains? What about grease traps?
I have not heard of any ADA plans like you mentioned. Down here in Commiefornia, we don't get any breaks on ADA.
I was dumb enough to build out two high end restaurants for the same family. Its all they do, upper end restaurants. I remodeled their home is how I got the restaurant remod. job. I hate the work hours and there are so many things that are foreign to me but its all in the plans.
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