In both cases, San Diego and San Fran, we told the marina we were moving to the area and needed to liveaboard
for a fixed period on our boat to find housing. Both marinas
were very happy to give us a short term period for that. In San Diego, the slip agreement allowed us one 21 day "vacation" on our boat a year, so we used that, and then they gave us a two week "househunting" exclusion that they had written into their corporate rules. That was a CYM marina. In San Fran, we talked to the harbormaster at our marina, and he was amenable to having us stay aboard for 2 weeks if we would pay a "high use" fee that was equivalent to half month liveaboard
rate. So -- if you really are looking for onboard while waiting for a house to close, if you can produce documentation
of that house, etc., I've found marina managers willing to work with you. I've been totally amazed at what will be given is you just ask for it up front and work it out vs. trying to sneak.