@Tim Kaminski Some of the deck renew procucts have a sandy texture.

Sandy area as well is doing pretty well for higher market rents with less stipulations.

Maybe put soil on everything so the broken cement surface and the dirt area is covered with the new soil.

No matter whether it is petty theft, your groceries out of the back of your vehicle or buying a beautiful condo overlooking a white sandy beach on the ocean. 

What do you do generally do in poor soil conditions:Crawlspace or Structural basement? 

@Jay Hinrichs I used to play in the Sandy river and pick raspberries for the summer at Mershon's Farms up in Corbett.

This sealed off the dust, and gives a grand storage/workshop area,   HOWEVER, it also sealed off the airflow, with the result that any dampness wicking through from the outside soil makes any nearby surface mold heaven.

engineered checklist alone is going to cost to find out if they would allow ( depends on soil) Do you know how many feet down is the water? 

I think as Wayne said you can add a new roommate and amend the existing lease with an addendum.I would also screen the new roommate and make the addition of this roommate contingent upon him passing your screening.Also will have to make it clear to your tenant and new roommate that once he is added he inherits "everything".If your current tenant has damaged a wall or soiled the carpet prior to the roommate's occupancy, this roommate is now liable to these damages.

I am not a contractor so I don't even touch a house this old (and very rarely run into one this old in the Dallas area),,,that is the type of house you start to fix one thing, only to discover 3 other problems....I know in some parts of the country houses this old are 'normal',,,,they aren't in Texas,,heck after 100 years and the way the soil moves it probable needs to change it's address