The address for them on the catalogue is "Wembley House", Central Square, Sydney, NSW.
I've chased up "Wembley House" and the following picture from a website shows it at 841 George St. Haymarket which is close to Railway Square the possible later name for Central Square...
They finally moved into Pitt St. just around the corner and were there until they were given notice to vacate by the land lord in the 1990's, The Australian Gas Light Co.
Reg Hardy then considered it was time to retire and W.F.Omodei Pty. Ltd was no more.