I think they would have the original plumbing and likely the electrical also.

Newer plumbing, electric, brand new roofs, vinyl siding, all 15 are carbon copies.

You can also sister new joists to the old ones, that was harder for me as I had a ton of electrical and plumbing running along and through the joists. 

The Illinois Manufactured Housing Association is currently fighting two bills in Illinois that would allow rent control law and regulations.

Capital improvements do not include the following as set forth in the regulations: correction of serious code violations not created by the tenant; improvements or repairs required because of deferred maintenance; or improvements that are greater in character or quality than existing improvements ("gold-plating" "over-improving") excluding: improvements approved in writing by the tenant, improvements that bring the unit up to current building or housing codes, or the cost of a substantially equivalent replacement."

Is the plumbing lead or iron pipes?

YOur going to run into venting issues, and plumbing issues, changing to stackable units,, and you'll lose storage space..keep it in the basement, you'll have less headaches from leaking water... 

Electrical, plumbing, roof, rehabbed already, etc. last owner said he got between 900 and 1100 in rent. 

Learn electrical, learn plumbing, the basics!  

Had a company that AHS sent over last year that replaced a heater, no issues.Different tech this year, same subdivision, different property, same setup (no pressure reducing valves and no pressure tank), and tech claims it needs "Sediment trap, expansion tank, T&P modifications, and permit", essentially more than what AHS says the new tank itself is worth.Figured I'd ask here if anybody knows the exact regulations, because the tech seems not to want to explain anything other than "We can't tell you by law, only American Homeshield can, we've told them what it needs".