Regardless of where in South City you are located, you should start the process by finding out what the current market value of your home is and whether the possible proceeds would be sufficient to cover your outstanding mortgage. In the second option of renting out, inquire about the current rental rates for your type of property and whether that monthly income would be greater than the added operating costs, mortgage and the fees of a property manager, which you may need since you are relocating out of town. Having a good overall picture of all the numbers will help you make the right decision. I live and work in South City myself, and would be happy to do a free comparative market analysis for your area, and sit down with you for a free consultation. You can reach me at 314-336-1937.