Typically, this results in the loss of hundreds of affordable housing units.

Open houses are typically used to generate leads, not sell houses.

Perhaps do a case study with a hypothetical deal you think is typical for what you are looking at and compare it to the alternative investments you might use and their expected returns.

typically with seller finance there would be some period of monthly payments and then a balloon where you pay off the balance in full. 

In any contract you don't typically need a clause saying what you CAN do, its assumed you can do anything legally allowed as an owner including sell.

Typically, we see anywhere from $600 to over $1000 per unit (maintenance and turn costs)  depending on these factors. 

Helps with your debt to income, better opportunities at cash flow, and typically requires less down to purchase.In regards to challenges, I usually build in an extra 10-15% to deal with things that I can't see behind the walls, including dry rot, electrical or plumbing issues, etc.

The way to get access is typically reaching out to the sponsor and getting the PPM and the documents you need to do a thorough review.

These loans are short-term as you mentioned, typically 12 months, so you'll need to refinance before that balloon comes due.

The IRS generally does not allow you to deduct expenses for a property that has not been placed into service, as deductions typically apply to operational properties actively being used to produce income.