It would be more appealing to the buyer if it was an empty lot.

Always buyer beware, there are scam coins out there.

As a wholesaler, I've given 3% to a realtor for bringing me a cash buyer...But everything is negotiable!

If it's an already renovated house the buyer leads aren't investor buyer leads.

What's the best avenue for marketing for buyers? 

Also, to make your money go farther, cutting down closing costs is a great way to do that, We can help with that, which is why we offer 1 point Origination Fix and Flip loans.Is sounds like you already have a portfolio, you may want to look at refinancing your existing portfolio to free up cash for future purchases, the buyer's market is only going to last so long as these interest rates are being cut.

As a buyer am I allowed to ask for that type of documentation?

Get your funds and do the needful things so the primary can be financed by a future buyer, or can be rented. 

Are you finding it to be a major concern for buyers, or do they seem willing to overlook it in certain areas?

To clarify, im am the seller not the buyer.