It's known as the 4 floors of whores. Google will provide more information.
I went there for entertainment (no, not THAT kind). My wife and I, and our friend who was living there went there one night. Since I was with a woman I was safe and no-one bothered me, but my poor buddy got mobbed, it was hillarious.
Imagine a 4 story building full of night clubs. On an average weekday night the clubs are packed, but only with woman (err, working women) and a SMALL handfull of guys (10:1 ratio easy). It's just comedy to watch.