Tax sales are a balancing act among (1) the need of government to collect property taxes and, if owners will not pay then, then to provide incentives for investors to purchase the tax rights and (2) investors, who need an attractive return for the risk they are taking, and (3) citizen taxpayers, who should not lose their property and all equity because of small debts and perhaps temporary or at least relatively short term financial difficulties.

In my market, agents/investors/wholesalers pitching creative financing get this objection as well.They typically have a 2nd offer (usually much lower purchase price) for the owner to be able to accept now and cash out. 

However, there's no AC and heat there and I have already purchased min splits air conditioners and an electrician has also laid the lines for me.

Purchase price: $60,000 Cash invested: $20,000 Sale price: $240,000 Lakefront duplex Denver Colorado.

However, the house is not selling, having me consider more than once to rent it out, tap into my equity, and purchase a fixer-upper triplex in another part of town (where I would also live).

That means you can spend up to $70,000 on the purchase price and renovations and it would still be considered a good deal, according to the 70% rule. 

Purchase price: $162,000 Cash invested: $1,460 Sale price: $272,000 Contributors: Peter Vekselman Partner Driven, in collaboration with our partner Seth Choate, successfully completed a deal on N Pasadena Ave, Waterford, CA.

Purchase price: $560,000 Cash invested: $55,000 The strategy going in was part live-in-flip, and part ADU value add.

Purchase price: $175,000 Cash invested: $34,000 Sale price: $750,000 Single family Vacation rental direct sail boat access.

@Connor McGinnisConsider evaluating the pro forma rents from two perspectives -determine the maximum amount you can increase the rents without making any renovations and then figure out how much more you can raise them with renovations.