The 40-storey tower stalled at the groundworks stage earlier this year.
But Brookfield’s property arm upped its stake in the scheme on Monday after buying a 37.5% share from Great Portland Estates.
A tower crane was working again yesterday on the site raising hopes that main construction work will re-start.
Brookfield Multiplex’s contract on the Pinnacle tower – also on Bishopsgate – is still stalled following ongoing funding problems.
A Brookfield spokesman said construction would not restart until a lead tenant is secured.