Both sites are within yards of each other near Liverpool Street Station in the heart of the Square Mile.
Brookfield Multiplex hoardings have now gone up on the 100 Bishopsgate scheme where demolition contractor Keltbray is currently clearing the site.
Plans for the project include a 165 metre office tower being developed as a joint venture between Great Portland Estates and Brookfield.
Main construction work is expected to start by the end of this year as demand for commercial space in the City of London continues to rise.
The developers are expected to give the green light for the main construction contract once they sign a pre-let deal with a major occupier for the scheme.
Brookfield also restarted construction on the stalled Pinnacle scheme this morning where work stopped earlier this year following funding problems.
The Enquirer witnessed the first materials deliveries to the site today and scaffolding was going back-up around the concrete cores so Byrne Brothers can restart its contract.
Brookfield is main contractor on the job to build the 64 storey tower.