I don't care whom you are paying, I would think that alone should mean something. 2.

I would start by going right to this guy and ask for him to pay what I can justify for the cost of this issue to me.

Could my mother exchange for a commercial property and we pay rent to her?

Does the contractor's insurance pay to have the renter's stay elsewhere while it's being fixed?

You won't know until you put it in writing and an earnest money deposit.What happens a lot is someone calls the listing agent and says, "I'll pay $900K for that house." 

You could end up paying holding costs like loan interest, property taxes, and maintenance for longer than expected, which can eat into your profits.Then there's the issue of selling for less than you expected.

The costs of land  , engineering , site work , permits , labor , and building materials make this virtually impossible . then there are zoning issues and the rest of the politics that go along with this . 

Be aware that if you have a 401(k) or IRA, your fees are hidden and you are paying a lot more than you think for those fees.

NEVER pay anything to a hard money lender before closing.

When you donate appreciated securities that you have held for more than one year, you can avoid paying capital gains tax on the appreciation.