There could be something peculiar about your contract that makes it non-assignable (in short, check with an attorney to be certain) but, in general, UNLESS STATED OTHERWISE WITHIN THE CONTRACT, all buy-sell real estate agreements are personal property and inherently assignable. 

I had a 40 acre orchard in Santa Barbara sold 20 years ago but I've checked and the retired rock star who purchased it has had it on and off the market at incredibly low figures - check 1500 farren rd Goleta ca93117 could make an off Market /private agreement if you'Rare super motivated .

Check out All County Polk!  

I'll be sure to check the links you provided.

Checking account?

Also, it's imperative to check all plumbing and electrical, including smoke/CO detectors.  

Essentially the seller agrees that $X will come out of their check at closing and go to cover your closing costs at closing (debit Seller, credit buyer).

The attorney and accountant are important as they can help you set up your cozy.co (notice that isn't .com...that goes to something different) as it's simple to use, handles the background checks for us, makes it simple to collect rent and is easily linked to other social media sites so we can get the word out that we have a rental available.

Check Craigslist or Renter's Warehouse if you are looking at buying rentals.

Check em out, and tell Tim I sent you.Best,Scott Armstrong