Hi Allen,
We are GCs by trade so what we do is set dividends from the GC company each quarter into our real estate company and when it accrues, we look to make a purchase, usually at auction. When the list gets released we do our due dilligence in finding out what we can charge for rent and based upon the purchase price and the taxes, we figure out approximately how much it will cash flow. We are in a unique situation because we can construct and maintain the home at cost value instead of retail value since we do not need to pay another contractor which allows us to take more risk than the average person.
We use rentometer to find out the averages rents in the area and we use property shark to determine the property taxes, year the home was built, flood zone info, etc. we also use property shark to analyze what the comparable a in the area are worth so we can understand what the home is valued at given the worst circumstances. Some homes we got at auction required minimal renovations (paint, cabinets, carpeting, etc) some were complete guts. But if you plan for the worst and hope for the best you can really make a good decision on whether or not the deal makes sense.