Sydney's CBD office transactions market could experience a dramatic rebound by Christmas with more than $6 billion of office towers being offered for sale, following an almost-lifeless first half when vendors sat on the sidelines waiting to see the effect of COVID-19 on the economy.

The sudden influx of large office assets that could potentially be traded is now equal to the number that transacted last year. However, the economic landscape is very different with pricing expected to come under pressure for certain assets.