BRRRR Deal - What's missing from these numbers

Hello BPers and BRRRR lovers,

My partner and I got our first BRRRR deal under contract, it is a 6 unit near Fishtown Philadelphia. As we enter Due diligence, we wanted to figure out all the costs that incur from the different phases of the process (Buy, Rehab, Rent, Refinance). We put together an excel sheet (see picture below) with all the costs we can think of. But we wanted to get some additional eyes on it, especially from the ones who's successfully executed the BRRRR strategy.

What are some hidden cost you wished you knew prior to going in on the deal ? Or what would you change overall given this deal ?

For some more insights, we got a hard money lender who’s going to fund 90% Purchase & 100% Rehab. And we’re securing a Private loan to for the acquisitions, and to carry us through the rest of the project