A place where I see good money to be made is in houses that are undesirable because they are really weird but can be made unweird easily. 

Employers won't tolerate certain activities that are also undesirable in tenants so you would have additional assistance in getting a problem person out.

@Michael LoweMy family is against it because my uncle had a duplex in an undesirable part of town (even though he lived in it too).

Seems most foolproof solution, especially if you also want to clear, um, non-humid but undesirable air from the bathroom.Air King AKDT60 Delay Timer Switch Turns your fan and light on simultaneouslyAllows you to turn the light off while the fan continues to operate for an additional preset timeOperation time for the fan can be adjusted from 1 to 60-minutes

Even cash-flowing properties could be undesirable for a bank’s risk appetite for refinancing.

My first instinct would be to house hack, but we've already covered that this is an undesirable option for the individual.

It is very rare for a mortgage company to miss out on protecting their first lien position by redeeming the unpaid taxes.That's why the tax deed sales are usually a waste of everyone's time - the good stuff is almost always redeemed and by the end of the auction, only the tax deeds secured by undesirable properties are left standing.

Originally posted by @Marcia Maynard: We do a quick 5 minute-8 question telephone screening that weeds out most of the undesirables and gives me valuable information.

Meaning, if you own a larger portfolio and 1 property is experiencing undesired returns.

Low-density communities don't want to see higher density developments because it might bring "undesirables".