Quote from @Nicholas L.:
No I have not been in person, and what you are describing is exactly what I'm worried about.
I will say that I do have a contractor who I trust to do an honest thorough inspection (I requested several references who all gave positive feedback, and the one property I did ask him to inspect he found a major structural issue and immediately told me not to considering buying it).
It seems like when most people run into trouble its because their estimates of vacancy, maintenance, capex were all too optimistic. In my market I've been told to estimate 5% for vacancy, 5% for maintenance, and 5% for capex. This seems quite low to me so I've been assuming 5% vacancy, 10% maintenance, 10% capex. These are C+ properties built in the 1920s-1940s. Does that seem safe/conservative enough?
Re off-market properties, my realtor's office updates a master list of known OM deals. This is my current process: 1) screen for price range/target neighborhoods, 2) Calculate rent/value to identify properties at or close to 1% rule, 3) review photos/other info to ballpark estimate post-purchase capex followed by a more detailed deal analysis, 4) request contractor inspect the property to get true capex estimate, 5) make offer if the numbers work.
However, since Febrary I've only gotten to #4 once and never to #5. I can't tell if I'm being overly cautious or smart.