You can go to the City to confirm but I'd assume the  architect is correct with the timeline and potential costs. 70k for windows and doors sounds like more than enough.

If he has the reserves for minor repairs and vacancy, I think its a good equity play. 

If it's in Fort Lauderdale, I can see going to some lengths to check and confirm IDs.

Reserves (depends on the PML)7.

Personally, I would do the research first, get all the answers confirmed and then look into the market to do a deal.  

I think it developed some sort of reputation for being "haunted", and folks reserved a stay there for that reason.I built a new cabin in its place, and so far, no ghost tales

We both have cash reserves, my partner does have more liquidity than me being a property owner for quite sometime and having access to it's equity.

The 75% LTC lender that capitalizes an interest reserve and finances 75% of the closing costs will likely require less cash out of pocket than the 80% lender who does not include a capitalized interest reserve and doesn’t finance some or any of the closing costs.

Let's say Taxes are $200/month, and Insurance is $150, and you put $100 in a maintenance reserve.  

I would confirm all this with your lender.