Matt,
I'll chime in here since you mentioned El Segundo which, is only 5 miles of great sailing away from Marina Del Rey, this sailor's home port.
web page MDR has the only municipal mast up storage in Los Angeles and the only other one fairly close is more than 50 miles to the north in Ventura.
Not only is it the only municipal Mast Up Storage, but it may be the only mast up storage that has space avaiability.
The price is indirectly subsidized by the taxpayer (Thank-Me very much) and the monthly fee includes unlimited use of the public launch ramp and associated parking lot. For reference, the daily launch fee is about eight dollars.
The launch ramp has docks and most people use an automobile and trailer, some catsailors use beach wheels on occasion.
Here is a link to the facility:
google map of the facilityOnce here, you will be greeted by Hobiegary who will welcome you to the Santa Monica Bay where there are hundreds of square miles of great sailing.
GARY