Should you analyze a potential rental property using market rent?

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I'm looking to make an offer on a duplex and my analysis is based on the current rent. Should I be using the market rent when analyzing? The property will be delivered vacant and the comps are the same amount as the asking price.  When I use the current rent, my calculator tells me to offer lower than the asking price but when I use the market rent, my calculator tells me that I'm ok to offer the asking price. Any feedback will be greatly appreciated! Thanks for your time!