After I realized that the house was not salvagable, I planned on tearing it down and building even a manufactured home to rent.

The only exception is the HVAC/roof; if these items are half or less of their expected manufacturer lifespan it would be worth it.

State and local laws may prohibit this, but this may be an interim strategy.In any case, part of the real, future value of the property, other than simply filling up vacant lots, might also revolve around the new owner (maybe that will be you) buying up cheap manufactured homes, placing them on the vacant lots, then renting both land and home.

Type in different terms (pre fab housing, modular, manufactured housing, etc.) 

As a result, both because a purchaser’s right to litigate a cancellation without the benefit of an injunction will often be uncertain and because an injunction provides a second chance to cure the default if the defense fails, purchasers will still almost always be well-advised to, if possible, procure an injunction in connection with contesting the cancellation of a contract for deed or a purchase agreement.Every state has different laws, and some don't even allow contract for titles in the case of manufactured homes being sold and financed sans real estate.

We own a manufactured home community and we do not allow dogs.

Curreny I have one SFH and a manufactured home.  

The property is a manufactured home built in 2003 in Colton, CA 3/2 1500 sq ft that rents between $1300-1400 that we have under contract for $120k on a short sale.  

Detroit was once the most prosperous manufacturing city in the world.In the 1950s, Detroit was a major American city with a dynamic labor force built on the manufacturing miracle that won World War II.

And most foreigners are far more attuned to owning RE in the US than US citizens are by and large.what I see out in the mid west is just towns that were the silicon valleys 100 years ago run by steel auto and manufacturing.