but thanks to an old GTA 2 map editor that was tucked away in the corners of google. I was able to extract them into the .cae format...
GTA 1 Maps - Liberty City (NYC), Vice City (Miami), San Andreas (San Francisco), Manchester (GTA 1961), London (GTA 1969)... (17.8MB Zipped & 394MB Unzipped)
GTA 2 Maps - Downtown, Residential, Industrial... (15.4MB Zipped & 305MB Unzipped) (OBJ Version)
As an added bonus... Here are the GTA1, GTA2 and GTA London radio stations, they are converted from their original wav format to mp3
GTA London 1961/1969