Parking Lot

[helicon1]

I used the paid parking lot for the first time last night (My car was broken into on U St. ten days ago)
 
 After the show was over, I got back to my car and it did not seem that there was a monitor around the remaining vehicles (only 20 minutes after the show had finished)
 
 At what point do the monitors leave after the show is over?

[eddie]

The lot attendants are out there until at least 30 minutes after the show or until all of the cars are gone.  They aren't as visible towards the end as they usually sit in their personal vehicles out on 9th st.