Aviva Investors has placed 33 Kingsway, WC2, on the market.
CBRE is understood to have been appointed by the firm to look for £65m, reflecting a 5% yield for the 60,173 sq ft office building.
Located close to Aldwych, the property features balconies on floors two to six and has 46 bicycle spaces, 43 lockers and five showers.