Rental Property that Cash Flows only by raising rent...

[Stephanie Cessna]

I am analyzing a property that came out as have a $918 /mo cash flow and a 25.63% CoCRoi. But this is when I used the BP insights calculator and had rent estimated at $1200 per unit (this was already using the lowest estimate). The current tenants are paying $650/month with a 10 month lease and $550/month for a month to month lease. Would I have to keep the existing contract for the 10 month lease? These rents seem super low compared to what the BP insights says I can get but is this not an accurate rent estimator? Any advice??