Have not heard of "gas service" either. No pipes lines for domestic use. I can't even begin to imagine how deadly that could be considering the amount of power theft around this country. Oh, and have you seen all the broken water pipes that scatter the area..aye, aye, aye.
If you live in an apartment I strongly suggest getting your own tank/ cylinder, as skippy1 posted. You might want to look into what HB posted i.e. rental agreement. There could be a section on what to do or what not to do concerning this issue in your lease.
Ask other tenants, if there are any, what they use. BTW? What would you be using this gas/ propane for? I'm assuming cook stove.
At my house I have a 100# cylinder and only use it for the cook stove it lasts about 6 months of high use.
If you do get your own cylinder make sure to have the tank/ shut off valve readily accessable and don't forget to put on a regulator valve.