PHOTO: Mike and Annie Cannon-Brookes paid $100 million for the Fairwater estate.

The property empire of tech billionaire Mike Cannon-Brookes had already become the stuff of legend among Sydney property watchers by the time he amassed a portfolio of more than $240 million last year, but a slew of recent high-end purchases has swelled his property assets by more than $25 million.

Luxury weekenders on the Newport waterfront and Pittwater’s Scotland Island and yet another farm and heritage house in the Southern Highlands have all been widely tipped as the latest acquisitions this year of Cannon-Brookes and his wife Annie.

However, unlike Cannon-Brookes’ many purchases of previous years that were lodged in his own name  or in corporate entities directly held by him, his most recent purchases have been cloaked in secrecy and a spokeswoman for the couple offered no comment for this story.

Chief among their latest acquisitions is the 15-room Cooliatta mansion built  in the 1880s in Burradoo in the Southern Highlands for $3.9 million, complete with what the National Register of Big Trees says is the largest cedar deodar tree in the country.

Somewhat fortuitously, at the same time as Cooliatta was on the market, the 27 hectare farm adjoining it was also listed for $7 million by Duncan Hill Property, and sold in March amid widespread talk it is to be consolidated with Cooliatta by the Cannon-Brookes family. The sale of the farm is yet to settle, and Duncan Hill would not disclose the sale result, but it is expected to settle for less than $7 million.

That makes it five substantial properties owned by Mr Cannon-Brookes in the Southern Highlands given his Joadja farm, the $5.35 million weekender Rosehill Farm and their Kangaloon farm, Widgee Waa.

162 Prince Alfred Parade Newport

The Newport house set on 2660 square metres is among the latest property purchases by Mike Cannon-Brookes.

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