How can one determine what a good rental price for a communication tower lease would be in the San Francisco area? We have a cellular tower that has Verizon and Cingular (AT&T) and in addition there are multiple services that have their whip antennas and microwave dishes mounted. It's loaded to capacity we think, because we are at a higher elevation and they want to curtail to many of these being built. The tower is controlled by a large tower management company and we tend to believe that we are getting far less than what the true value of the tower is. We are in the final 5 year renewal of our lease and they have been trying to get us to extend or accept a buyout.