There are several homes in the Lantana/Lake Worth area with guest quarters available... Donnelly Dr. extends to either side of Congress and it would also help to know if you can remember if the property was a For Sale By Owner or an actual MLS listing. It would certainly help the Realtors online who are trying to help you find it again! We want to help, the more info we can get, the better :)
If you haven't been helped, please don't hesitate to give me a call, 954-770-5568.
Gino Herring, SFR.