Owners and Property managers won't let me see tenant occupied properties

[Tyrell Ferguson]

Recently Ive been doing online searches with my realtor to buy a tenant occupied property in Baltimore.  We have no problems finding them but when we try to make an appointment to go see them we get the run around.  We set up a date and they'll (the other realtor or property manage) will say Oh something came up lets reschedule and we  won't hear anything back. They say oh the house is no longer for sale but we still see the listing several weeks after.  This is the 3rd rental property I wanted to buy that this has happen with.  It's understandable if people don't want to sell properties that are making them money but why would they list them as for sale. Some have been on the market over a year.

Is it my realtor? Should i just put a contract in site unseen with a contingency that a tenant must be in place at time of purchase? I don't know what to do but I really want and need to get things started please help.