i am in the house flipping business as a sole proprietor, i was wondering if i can apply for SBA business loan for a few million?

For general costs, continuing ed etc. just as sole proprietor real estate investor. 

do I just take the loss as the sole proprietor of the contracting company has passed?

You said wife is “sole proprietor “ You can most likely role your old 401ks into your IRAs or possibly your present employers plan. 

My wife and I are the sole proprietors of the business that that sponsors our solo 401k (unincorporated sole proprietorship). 

If you are a sole proprietor then most of what you need can be simple.

Per the IRS: "Use Schedule C (Form 1040) to report income or (loss) from a business you operated or a profession you practiced as a sole proprietor.

a 9 unit that leases for $8m/month for $650k, a 10 unit for $815k that leases for $9,500, and last year a 32 unit for $2m that leas for $28k1% is not only easily doable, but would be my MAX MAX MAX I'd pay and I'd only pay that (I haven't yet) if I LOVED the building or area or there was some other major factor (sitting on tons of land, or new class B+/A, etc.)Quite the portfolio; are you doing this as a sole proprietor or represent a bunch of investors?

In my case, I've had to personally guaranty all financing every time whether it was a SFR, multi, or commercial and whether it was real property or undeveloped land and regardless of the business type entity, Sole Proprietor, Partnership, or Sub-S, etc.

There are pros and cons to being a Sole Proprietor or having a LLC or a SubS or whatever.