The origins of the cabin are somewhat murky, but property records from the application for demolition show that a woman named Mary Rose bought it at auction from the Frederick sheriff in 1827 after the previous owner, Peggy Rose, had caused a “breach of the peace.”The notion that it is an old slave quarter is not supported by any record I know of and seems dubious, since the cabin was obviously built to front on a town street. (Unless it was moved to its current site, but there isn't any evidence of that.)
Mary Rose passed down the property to her granddaughter, and it changed hands many times.
Historic people really get out of hand sometimes.When buildings are not cared for, they fall apart and are lost. To have any impact, historic preservation efforts have to begin long before that happens. Out in the woods you can get away with ignoring old ruins so they will linger on as background scenery, but in the middle of a populated neighborhood that is not really an option.