Guidance for Multifamily in Washington DC

[Aman S.]

I am looking at multifamily deal in Washington DC (NE and SE) . Five different buildings with total 32 units. I have rent estimates on these units. For single family rentals I typically do 1% rule, that is my purchase price can't be more than $150k for $1500.00 monthly rent. Is there a quick analysis formula for multifamily? See the attached picture for rent estimates i.e . Is there a percentage of gross rent typically used for operating expenses to calculate NOI (i.e. income before Debt payment)? I have good experience in single family homes but new to multifamily. Any advice/suggestions?

Thanks

Aman Singh