The $1.3 billion Wesley Place project on Lonsdale Street by property fund manager Charter Hall will see the building at number 150 reworked, but not redeveloped.
The building, which sits next to a number of properties owned by the Uniting Church, is set to annex a new office tower developed by Charter Hall on land owned by the church, through a 125-year leasehold deal.
The development application submitted proposed a 6-storey podium to be added to the front of the existing office building at 150 Lonsdale Street, costing $300 million, and increasing office space by 29,000sq m.
The building revamp will also feature a new ground floor concierge, retail tenancies, a business hub and open-air terrace.
The building is already around 50% committed, with anchor tenants including RMIT University and the state government.
Charter Hall is also developing the car park at the building’s rear, known as 140 Lonsdale Street, into a third office tower.
The precinct will be one of only five green spaces in the CBD, with a ground-level grassed area and the premium tower at number 130 featuring four terraced outdoor areas.
The crown in the precinct, 130 Lonsdale Street, was designed by Cox Architecture, and boasts 60,000sq m of lettable space - 55,000sq m for offices and 4,500 for retail.
Lendlease topped the building out earlier this month, with full completion slated for mid-2020.
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