Abstract: A two level structure for parking vehicles or storing goods, which structure comprises a sunken pit, first and second spaced apart platform members which are for receiving the vehicles or the goods, support means which is mounted on the first platform member and which supports the second platform member in a fixed horizontal position above the first platform member, mover means for moving the platform members from a first position in which the platform member is in the pit and the second platform member is at ground level to a second position in which the first platform member is at ground level and the second platform member is above ground level, a water sealing arrangement for preventing the ingress of water into the pit, and emergency stop means for automatically stopping the descent of the first and second platform members in the event that the second platform member encounters an obstacle, the second platform member being such that it has a peripheral overlap portion which overlaps the rim of the pit, a