If you want my opinion I would leave it up to the experts to do this kind of job. This is much too dangerous to attempt yourself. You will have to work from the basement (if there is one) and jack this building up with you under it. It could collapse and kill you. It's not worth it but if you feel you can do it safely by all means go ahead but as an expert my recommendation is to hire someone. Still want to do it yourself? OK, here is one way to do it.
If it's 7 inches out of plumb it's a good bet that it may be rotted or termite damaged at the sill and there is no jack that can help you at that point. The jack will just punch through the wood. Run six by six beams (the longer, the better) along the entire 36 foot length and place a jack every six feet under the building. You can use temporary adjustable lolly columns if your basement ceiling is high. (the screw type) they will hold as long as they are no more than six feet apart. Make sure the beam catches all the floor joists that way there it will take the pressure off the sunken side. Crank the columns (or jacks)slowly and evenly. When it is finally up you can install concrete blocks (fill the holes with concrete) to replace the foundation making sure they sit on a good footing, (the existing foundation may be good enough). Keep an eye on the floor joists too so that they don't end up twisting on you. You should lean 2x6's against the gable ends at the exterior so the house doesn't slide or teeter-totter in either direction at the 24 foot (gable) ends. Install pegs or pins into the ground the building to keep the 2x6's from slipping at the bottom. You can use 2x4's to accept the gable end supports at the tops by temporarily nailing them to the house and wedging and toe-nailing the 2x6's into them. Do this on each gable end. Check everything as you increase the height up to plumb to make sure nothing is left to chance. Be careful.
Hope I helped :)
I am a little irked that after all the help you received regarding this issue you decided to say that we were of no help. You received quite a bit of good information here from a lot of knowledgeable people and it was all based on the limited amount of information you gave us. And yes while it's true you don't have to accept and/or pay for this knowledge it would have been nice to at least have allowed us to assist you.
Every time one of our answers is not accepted our individual ratings drop and we know that but that is a chance we have to take and we do it. All of us spent quite a bit of time analyzing your situation and giving you the best information and suggestions we could.
I hope you don't become one of the regular customers who asks questions but never pays. I don't know how much time the other experts in this forum spent on your question but I must have spent an hour trying to figure out a good remedy for your situation and for you to shrug me off was a little upsetting.
That's when 2x4's were true 2x4's. Not to mention the fact that the old wood is pratically petrified! lol I'm glad it was you and not me lifting those trusses! Yes cables and turn buckles is another good idea but appearently the customer doesn't want to hear it. Oh well!
Just make sure your cable is strong enough (even though you will be chaining it to the tree.
Good Luck :)