ok , i get it now, the map to paradise island? that's on like, the top story of the ferry boat. just keep going up stairs and if you see a blue piece of paper on the floor next to the bed, i think, that's it.
if you mean the map to see the whole city, then its not actually ON a building its in the botton left hand corner of your touch screen and it looks like a ball with a grid filling it in, touch it a map comes up and to get out of it, theres a red arow in a box in the bottom right hand corner. i hope that helps!
You might try your favorite search engine and enter 'URBZ discussion board'