There are several ways that you can investigate a property's history in Baltimore. Some government agencies may charge a fee. You may first want to start with the library. Old maps of Baltimore including real estate maps can be found at the Pratt Library's Maryland Department.
You can also research a property at the Maryland State Archives Guide to Land Records. Also, the Maryland Department of Assessments and Taxation provides records that will show a chain of ownership for a particular property since the first owners. Information includes a description of the property, land, and buildings as well as remodels on that building.
The City of Baltimore can help you find the information you seek from the land records division of the Baltimore Circuit Court.