All of my tenants have my personal cell and I estimate I took maybe a dozen texts and three or four phone calls over the past year from multiples of units.

Not as comfortable assessing the market.

My most recent assessment of the retail sales market: prices are flat-to-depressed, but time on market and sales volume are up.

We had property managers that didnt know the progress of the rehab which they were managing 1 month after the deadline, simple tenant billing agreement (for the transfer of payment of water) could drag for half a year such that the water bills end up as a special assessment on the property tax, and then they turn around and say they are not responsible for the special assessment payment and will not get it from the tenant/or credit the payment back to me (water bills don't come to me, it goes to tenant and PM).

We have been working with a civil engineering firm to prepare the soils reports, assess zoning, etc, etc and a RE attorney.

Dozens of multi-million dollar homes are in development just a few blocks away.   

After long considerations, a dozen spreadsheets, and touring it a handful more times, I decided I would buy it if the price was right.

Without answering your question directly, here are some the thoughts just off the top of my head.Look at the last tax assessment for the % land compared to the structure %, then figure the market value of the place unburned.apply your land %.Less Scrape Cost to get the old debris out to the dump (including any insurance needed to have workers on the site).Can you reuse the utility meters, drop and electrical breaker panel--if so keep them.Same with kitchen and bath things.This will give you what I'd call "Preliminary Reference Book Value" for the lot--post loss. 

If it were me, I would want to go into that apartment TODAY to assess the condition, and determine what i need to get it rented ASAP.

The person countered me $200k more based on the County tax assessments.