Imperial House at 15-19 Kingsway WC2 has been bought by CCLA.
The sale price was reported to be £39.85m.
The vendor was The Church Commissioners For England, who had put the London property up for sale last month.
Built in 1913 by Treherne & Norman, Imperial House comprises 47,450 sq ft of office space over ground and eight upper floors and 3,428 sq ft of retail on the ground and lower ground floors.
CCLA was advised by GS Capital Advisors