I would interview five.....two small ones, two national franchises, and then depending on where you get a good fell ad a 5th in there.Three questions I always say to ask:1.

I'm not even considering the slab...IF, AND ONLY IF, the slab pans out to pass city approval, codes, permits, construction plans, drawings, ADA compliance, will it be a "value add." 

Yes, rent rate per sq foot, but you also have to offset that with extra hallway space which doesn't make money, premium pricing for first floor or near elevator, Large sizes closer to elevator and smaller sizes away, larger sizes on first floor and smaller sizes higher up, ADA compliant hallway/door width/elevator sizes, cart sizes, cart corner bumpers, foyer area, any box/product sales (sqft taken), placement of elevator in the building to minimize distances, structural wall and beam placements,  etc. 

:)  I called on this craigslist ad a long time ago on a house in that area. 

Even if you rent it for less, it will save you a lot.For example, a simple ADA bathroom will easily cost $ 6-7,500.  

Our last commercial project was originally not in current ADA compliance when built (early 80's), and due to the extent of the renovations the county required us to bring the building into compliance, which was lots of $$$$$.

-HAZMAT mitigation-Additional plumbing installed and water consumption (commercial building usually has fewer bathrooms)-Neighbor protests to your re-development idea-Bringing an old commercial building up to modern residential codes (fire/ADA/safety/etc)-Are any amenities close by (industrial neighborhoods don't always have a supermarket or restaurants near by)?

You will get all manner of quotes, depending on materials and other factors- will you have xray machines, do you need center run power /water (i.e. dentist office) or do you do day surgery (will require automated backup generators IIRC), are your clients physically disabled, do you need chair lift, if you change an old building do you have to make it ADA compliant. 

We told her that she is allowed under ADA and Airbnb guidelines to bring a dog as long as the animal is not out of control, never left alone at the property, and that it must be housebroken (copied and pasted from Airbnb's website). 

The plan here is to hold the building and, down the road, if/when the main tenant leaves, convert the first floor into a small bar w grill to be owner/occupy.Issue: over the past three years, the current owner has spent $28k on upgrades, improvements, repairs (bringing building up to code, ADA compliance, sprinkler work, window installs).