What marketing techniques/venues do we use to find prospective tenant buyers who will ultimately be able qualify for a $285,000 mortgage and pay from $1800 - $2000/month lease payments.

@Jeremy Johnson my advice would be to be to never ignore a good buyer with little to no transaction fees particularly if there is a hefty profit involved. 1031 is a good option but also don't overlook other options such as just paying the capital gains tax (gasp) or rolling it into one of the new opportunity zone investment funds.Make sure to negotiate a great long-term fixed lease for your own business as part of the transaction assuming you want to stay there.

We have a buyer for the property we are going to sell.

It would be a cloud on title, and would stop the seller from closing with another buyer. 

I have buyers that are looking purchase a home they already found, but their financing fell through.

Tell your Realtor to insert this escalation clause with your offer:"Buyer will increase their offer to exceed any bonafide competitive offer by $1000 to a maximum of $XXX,XXX.

Some of these builders have a broker's co-op and offer some commission to buyer's agents.

Only if you are the end buyer and need financing you should use a lender.

This type of asset will look great in picture and probably even a spreadsheet but won't perform well for a new OOS buyer.

When I look at the buyer contacts, a rental company  comes us, if that matters.