In those houses, tilting floors are VERY common.  

hi john. thanks for the pictures. in regards to the rear patio and steps. look at the pipe coming out of the wall. it is in direct line with the worst part of the patio, where the lowest part of the patio is sinking. what you have here is water intrusion. the water is getting under the patio and sinking the base underneath. the steps are based on the patio so it is following wherever the patio goes. what you need to do here is totally tear up the entire patio, steps and everything. re-do the base and put in a new patio. first things first, you need to do away with the water source that is causing this. could be water from the roof, could be from that pipe sticking out of the wall right there. look at the path the water has left on the patio and the grass beyond it. you have a virtual river flowing there. that patio was designed to move the water toward the middle and funnel in into the yard. the problem is, the water is funneling toward the center of the patio but seeping under it and destroying the base. the new patio needs to have the highest point at the house and tilted toward the yard all the way across the patio at a 4 degree angle going FROM the house. that puts the water into the yard at a moderate pace and spread out across the entire patio. the front porch, same thing, you have water intruding underneath the porch and eroding away the base. find the source and reroute it somewhere away from the house. then rebuild the porch slightly tilted away from the house. 

As you can see by the sill plate they framed that small wall to the left on the floor and tilted it in place.

Right on man, way to be patient until the numbers tilted in your favor. 

@John Clevenger - 1) That the rules/laws are tilted in favor of investors. 

And those choices will set your parameters for types of materials, etc...I think looking for more modular, remote built homes is the alternative, but I wouldn't want one....The only other thing I can think of is building residential homes the way they do commercial buildings.....tilt-up concrete walls, sealed windows and all that....pretty sterile and cold.

Otherwise, the split tilts away from your favor.

Is there any cracking within the wall or is it just starting to fail (tilt) as one piece?

I highly recommend Top Star Egress as they were extremely cost competitive and the work was wonderful.We had a European tilt and turn - all in for $3,700.And a very large window slider for $5,000 (seriously massive window, looks great)!

I tilt my hat to you.If you have time consider spending 30 minutes for 30 consecutive days on Bigger Pockets.