How to compare cap rates - Mutli family

[Jamie Goldenberg]

Working on my first multi family deal. I am working with a partner who is allowing me to learn and underwrite some properties for him. I am trying to figure out how to find good comps. I am specifically looking at a mix used building (5 residential units; 1 commercial unit). What is the best way to figure "price per door"? What is the best way to find cap rates for other recent sales? Any help is greatly appreciated.