any unconditional absolute guarantee I would be scared of. we do build to rent but we always say that rental rates are based on rental comps in our area. we have data that backs everything up. what market are you in?

If one partner unconditionally guarantees the debt, this can sometimes require some side room guarantees to that partner to ensure no one recognizes a capital gain.As a few others have alluded to, there is a secondary problem known as a "debt financed distribution interest expense." 

Then duct loss mitigation & duct locations & thermal resistance in unconditional spaces.

Once all leaks are sealed, adding insulation is next in the order ceiling (attic), floor (crawlspace, unconditioned basement), wall.

All contracts, options, or other devices not based upon a substantial consideration, or that are otherwise employed to permit an unlicensed person to sell, lease, or let real estate, the beneficial title to which has not, in good faith, passed to such party for a substantial consideration, are hereby declared void and ineffective in all cases, suits, or proceedings had or taken under this chapter; however, this section shall not apply to irrevocable gifts, to unconditional contracts to purchase, or to options based upon a substantial consideration actually paid and not subject to any agreements to return or right of return reserved.History.

If that’s not happening because the dude seems like a douche, borrow the money BUT make sure that you negotiate the payment in cash AND make sure that you get a UNCONDITIONAL release of lienNext time make sure that you get someone to oversee your project and the subs. 

fee simpleThe greatest possible interest a person can have in real estate.fee simple estateAn unconditional, unlimited estate of inheritance that represents the greatest estate and most extensive interest in land that can be enjoyed.

On the other hand, if a winning bid gives you the deed unconditionally, with no chance whatsoever to turn back, then yes, you should do a title search beforehand.2) & 3) Ask the County.4) I would.

If your agent didn't do what he promised, you should have asked for unconditional release.

I know it was a ballsy move, but I offered over asking, unconditional, to close for September 28th.