Properties where development has stalled may be in violation of stormwater permit requirements.  

I have never added a unit, but you also have to think about zoning, permit fees, architectural drawings, etc. 

Unless you are a pro at eyeballing the cost of the rehab (or have a friend/long term relationship with someone who does this for a living), pay a contractor to go to those 3-5 you identified to get a better eyeball estimate (and make sure your contractor is adding permitting and other fees).

I write a permitting approval contingency in every offer to ensure the strategy can be executed after purchase. 

If you can like Josef Hardi said get in touch with the city, particularly the permitting department they should be able to point you in the right direction for any code related issues.You could also talk to a local electrician, and plumber for concerns related to those trades.

The delays in remapping the flood zones by FEMA, in combination with a business partner fallout, as well as having several GCs and architects incorrectly submit permits and plans for approval resulted in a VERY drawn-out project.

If not, your property will continue to stay in the master database so that it may be matched with a carrier at a future date.The company will then negotiate the lease with the carrier on your behalf in order to maximize cash flow and ensure the terms are most advantageous.The lease is presented to you for your approval.The company should manage the process for permits, construction and implementation of the rooftop equipment.The cash flow from the lease is managed monthly in a trust account and is distributed within 14 days of receiving the funds from the carrier.Your property should continue to be marketed by the company in order to obtain leases with additional carriers or upsell your current carriers.With 5G rooftop leasing, you typically won’t pay anything until a lease is secured and you collect the first month’s rent.

Pay him the balance of 2/3 only when the work is complete AND has passed inspection - you need to see the signed Permit Card.Remember you are paying him...if he does not want to do business as it should be done, then you need to move on, immediately.

I want to figure out every single cost associated with getting the building permit.

(in theory, they pay for these out of the fees that we're paying)- Permit fees (form of a tax)- Potentially estate/inheritance taxes for our heirs I get everyone's point, but it's not exactly a free lunch...