This quest is given to you by Vex . To " Sweep " a place is the equivalent of stealing EVERYTHING of value out of a single place, making this job a bigger, fancier version of "The Burglary Job". You will be given a RANDOM target at a RANDOM location. Also, you will be given a NUMBER of things to swipe ( such as 3 fancy items ).
Head to the mark and use your sneaking skills to get in. Obviously you're going to want to do this when the owners are either away or asleep, so be careful. Once inside, you will get objective arrows pointing to EACH item you need to swipe, so clean the place out and make your escape.
Return to Vex once you have the items for your cut ( 400 Gold ) and the job will be completed.