Must be a nice place for that price in the ATL. Have you approached the Coop and ask if they want to buy it from him? If one option is to drastically reduce the price and have it affect all other units, perhaps the Coop will want to purchase it from you guys in order to avoid affecting everyone's values. I think they'll at least listen because they'd want to maintain the health of the corporation. What about if you were to get your real estate licence and sell the home yourself, thereby saving ten's of thousands of dollars in commissions? I don't know what the process is in Georgia, but here in California you can get your license in about 3 months.
If you sell, the loss would be $90k + $42k = $132k. So to compare, if you were to rent and loss $1,500/mo... it'd be 7 years and a few months before that amount of loss would happen. A lot can happen in 7 years, not sure if values could get back up to $795k, but they just might.
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