I understand the build out requirements - elevator and such- and have factored this into the equation.

The renovation of the interior of this building would be a monumental process with the mention of the tiny elevators and ugly lobby.  

This is likely caused by elevated moisture levels in space.

Contact  PermaPier to shoot elevations, they do it at no cost and will also provide an estimate. 

Also we are looking for a land surveyor, if anyone has a good reference, to get an elevation certificate.

One board member is concerned that doing this would change our HOA from being non-profit to a for profit business and would require us to become ADA compliant (historic building that does not have elevators), pay extra in taxes, higher liability, etc.

Those numbers come with elevated risk and work.

You can't discriminate against someone in a wheelchair but it's not "reasonable" to install an elevator in a four-plex so the disabled person can rent the upstairs apartment.Emotional Support Animals are not limited to cats and dogs so the individual could have a miniature horse.

If a co-operative needs, say, a new elevator, it can borrow the money, using the building as security for the loan.

That price usually includes: formwork, rebar, fine grading (dirt needs to be provided to contractor within 1/10th of a foot of the desired elevation), pour, saw cuts, and clean-up (including concrete wash-out).If you opt concrete, be sure your contractor is placing his redwood header properly and anticipating where the pavement is most likely to crack.