When renting can a k1 form be used as proof of tax return substituting a w2?

Yes, it ia actually more through and informative. its very precise for the taxes are paid in advance .

I guess the above is from a fool who wants to prove it to all!

A K-1 or 1065 are the forms used for partnerships to report to both the IRS and their partners, the tax positions and income to be passed through. (A partnership is a see through entity and not taxable).

Only the landlord can decide what tax forms, or financial material in general is acceptable to him. (It would seem that if he was renting to the Partnership, a K-1 would be appropriate. If he was renting to an individual (even one of the partners) it would not. It would NOT be a partners individual return, just one of many forms more like 1099s that would be included in it).