The Pratt Library offers a wealth of information on how to learn more about your house. You can visit in person or access information online. You can also research through the following:
Land Records Division of Baltimore City Courts
Baltimore Heritage Inc.
Baltimore City Historical Society
Baltimore Architecture Project
Maryland Land Records Database or MDLandRec.net database
Maryland Department of Assessments and Taxation's Real Property Data Search
Good luck. Tracing the history of your old house sounds like a wonderful project. It may be time-consuming, but it would be wonderful to locate original paperwork or architectural drawings.