The company has purchased Yorkshire House in Leeds, Linley House in Manchester, Broadwalk House in Exeter, and Mountbatten House in Southampton.
The four sites together hold a GDV of over £175m.
The investment comes as Castleforge is looking to expand its foothold in the UK’s secondary cities which, according to the firm, have great potentials to grow as national and regional business hubs.
It plans to use its flexible workspace provider Clockwise to meet the increasing demand for alternatives to traditional fixed-term office space leases from companies in the four cities.
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By owning the properties outright, Castleforge can offer Clockwise members more flexibility and shorter-term contracts without facing pressure from external landlords.
The firm’s in-house research has predicted a rise in popularity in these regions as working and living trends continue to evolve.
Brandon Hollihan, founding partner of Castleforge Partners, said the company was thrilled to be contributing to the professional communities in the country.
“Select secondary cities in the UK are continuing to grow as business hubs for young professionals and exciting start-ups.
“Moving forward, for many companies flexibility is going to be key when it comes to office space leases.
“Through our flexible workspace provider Clockwise, we are very well positioned to offer this type of bespoke service to our members.”