Yes, a building hoist can be used to lift multiple objects at once, provided that the combined weight of the objects does not exceed the hoist's maximum load capacity. This is often done by securing all objects to a single lifting point or using a pallet or platform to hold the objects together. It's crucial to ensure that the hoist is rated for the total weight and that the objects are evenly distributed to maintain balance during lifting. Always follow safety guidelines and manufacturer's instructions to prevent accidents.