I would send a series of 4 mailers giving them free information they might find helpful to sell their home by themselves while setting myself up as someone with expertise who was just a phone call away to help.

Caveat being that rehab costs would be extremely high relative to ARV.

Financing with the HVAC company usually comes with hefty costs and interest rates.

Quote from @Lauren Olicker: Thankfully, all of these grand assessments are now levied, and those selling have either paid or will pay them at closing. 

if your serious just send them progress not perfection is the key. get talking to people and see where you mess up then pivot and fix that screw up. if you are writing letters you are far ahead of many. i would also say to add about terms cash buy/no fees or closing cost/ as is/ and so on\.

You can also try and incorporate a seller concession of up to 3% (with 3.5% down) which can help cover closing costs and reduce the cash needed to close.

Without knowing the renovation and soft costs, having the original purchase and eventual sale price is worthless data.

Last year, I purchased land and am in the process of building three additional villas, which I plan to sell in about nine months.

Row housing halves the cost to repair the wall water on a per unit basis and there are obvious additional values to having proximity to all units. 

The seller benefits from the spread between the interest rates of the old and new loans.Agreement: Ensure a clear agreement on who will be responsible for the existing mortgage payments and how any arrears or defaults will be handled.Seller Second Mortgage:Structure: The buyer gets a new first mortgage to pay off the existing loan and a second mortgage held by the seller for the remaining balance.Consideration: This may require refinancing the existing loan, which can be costly and may change the loan terms.I hope this helped.