First step is to make it to my father's apartment complex. He lives in the section closest to the beach, overlooking the carpark.
There are three points of access to the apartment - the elevator, the fire escape, and a wooden bridge leading from the main foyer and complex over the fake beach in the middle of the complex. The bridge is bolted to metal railings which are quite sturdy - one person could easily crowbar the planks out of the bridge, working backwards until they reach our apartment block. We could jam the fire escape full of couches and stuff, making it impassable, and the elevator could probably be turned off.
Then we simply raid the rest of the apartments for food/supplies. We can use rope for an escape down the edge of the balcony to the carpark, or up to the roof - where we can build a glasshouse for food as well as a secondary escape.