Two people are in a serious condition after a building collapse in Sydney's inner city, which sent debris crashing onto nearby vehicles. Part of a building gave way beside a Shell service station on Wattle St, Ultimo about 11am on Monday. A wall came down on top of some vehicles, a Fire and Rescue NSW spokesman said. Picture: NewsWire / Richard DobsonA Modus Projects spokesperson said the building that collapsed was not a site operated by Modus. Drone footage shows the extent of the building and wall collapse on Wattle Street in Ultimo, where two people were seriously injured.