I am VERY certain I have made some (or many) mistakes or left money on the table or overpaid etc... but all of these deals are cash flow positive after all costs + vacancy and maintenance. 

If the assessor doesn't count the sqft then that fact will come out during the escrow process and could sink the deal. 

I do TONS of deals like these so I'm not a keyboard warrior like you insinuate.

We allow the seller to leave anything behind they don’t want to deal with, and we minimize disruptions by arranging only one showing.

But if the condo would have been possible it would have been a great deal.

Those deals are gone now.

Use tools like BiggerPockets and house-buying apps to check if deals are good.

Now most flippers will say deals or money, so see if there's anything beyond that.

This is no deal at all just leave it alone.

This is such a ​​minor​ and standard request that I’d be careful doing business with anyone for which ​it's a big deal.