Just to fix and stabilize the foundation with push piers and foam concrete raiser cost estimate was $48K+.

Oh, you could try the expanding foam trick to raise the sunken side toward the house before tearing it out.

Good advice above which is good to hear because so often on BP regarding wholesaling, you hear people giving bad advice like lying to sellers, violating laws, etc.One thing I would add to the above, when finding your cash buyer(s), have your title company look up all cash closed transactions with entity names in your area and find the entity names that repeat multiple times in 1 year.

Probably not the guy you see in the mirror when you shave.

That expanding foam is iffy, sometimes they just eat it... :-)If you are reasonably talented and not squeamish, you can do this yourself, otherwise you'll need a Pro.

No shaving powder. 

This is the click-plank foam-backed LVP--not peel-stick (I do HD, for that, just bc I'm there a lot more)I think HD is always trying to funnel you into the higher-end stuff when it comes to vinyl flooring. 

Any thoughts on having an architect submitting plans after an accepted offer and clear to close to maybe shave off a month?

Often I go in and spray foam insulate as soon as possible which may cost me $7-10,000 but will not only save me oil money but will keep the units more comfortable year round and cooler during the summer keeping tenants electricity costs down for their A/C.

They then injected foam to fill gaps and further raise the foundation a total of 5 inches while adding more pressure to the helical piers.