Finding rental amounts for the vicinity of your property

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Hi everyone.  I'm close to putting up my condo for lease, but I'm having trouble finding comparable rental amounts for units already rented in the condo complex I'm part of.  Is there a resource I can use to find how much people are paying for rentals in the complex?  The problem is, I can get to open listing online with sites like Zillow, but once the condos are listed, they're removed.  So I'm looking for something more historical.  I need this information so I can properly price my lease.  Please let me know what you think.