Unfortunately, it sounds like locking up your bicycle is simply not enough these days in Venice. The LAPD is now advising that you keep them indoors. Maybe LAPD Pacific needs a few bait bikes like this one:
From LAPD Pacific Division:
We have been getting a lot of bicycles stolen.
1- Keep serial numbers and photos of bicycles on file.
2- Keep bicycles inside residence, not the front, back or side yard.
3- Take bicycles inside your destination, not locked up outside due to portable cutting tools.