Rents go from 900-1400C hoods are cottage style homes that are deemed functionally obsolete due to small sq footage, 1 bath, 2bed, etc.  

Optimally, these would be 3br/2+ba units, in which case they will often cash flow even while functionally obsolete.

This represents an ongoing battle for U.S. banking giants who also wrestle with the probability that branches will become altogether obsolete sometime in the short to long term.

This is a big threat to making your idea obsolete.

The associations will make themselves obsolete.

Any house with only one bath is technically OBSOLETE.

Probably can't be measured in pure $$ but will make living there more enjoyable.Adding a bath is IMO (and statistically proven) a moneymaker, particularly if you can do most/all work yourself, partiuclarly the "finish" like tiling, because it's very labor intensive.IIRC single bath houses have been considered "technologically" obsolete since the early '80 by the Amer.

The new SAFE Act made all these answers obsolete.

There is a lot of old mobile home inventory out there right now that will soon become become obsolete and abandoned.

As far as tax reform, eliminating the 1031 is only due to it becoming obsolete.