Put yourself in the lender's shoes: worst case scenario is that the rental unit is vacant for an extended period of time and the loan still needs to be paid, can you afford it?

Worst thing that can happen is he’ll say no.

*background info* I have a 4 plex I am closing on and going to live in the worst unit and attempt to replace the flooring of that unit myself as a house hackYou sound experienced in the flooring because the vocab is way above my head lol

I realized worst thing can happen (people can get injured from fire or crime) this was a problem deal with and may delay my investment objectives, but in the grand scheme of thing was not that big of deal

Worst case scenario, you are stuck for another 9 months until the lease runs out.

Worst case scenario, you could probably partner with a wholesaler there on it. 

Worst case scenario, you will see a reduction of cash flow at a lease up but I doubt that you lose $400 in cash flow.

Or, if possible, do both - buy a duplex/triplex/quad-plex, live in the worst unit and rent the others out.

I do not not know what your goals are and any experience you have in real estate or construction  and, if any, your financial education is.There are not many requirements on any loan but banks are one of the worst for beginners. 

Worst case, you can sell or refinance to avoid the foreclosure.