Himor Group has appointed the North West property and asset management team at CB Richard Ellis as managing agent of Ship Canal House in Manchester city centre.
King Sturge previously managed the 70,000 sq ft building on behalf of Catalyst Capital LLP, before it sold the Grade 2-listed building to Himor Group for £22.88m in February.
Nick McAllester, director of North West retail agency at CBRE, said: "King Street is often described as the Bond Street of the North, it offers occupiers a prime location for business activity but also for retail, which is vastly improving."
CB Richard Ellis is also joint office agent on the property alongside WHR.
Meanwhile, Himor Group subsidiary WR Estates is being rebranded as part of strategy to bring all of Himor's subsidiaries under one banner.
Himor Group is controlled by Langtree founder Bill Ainscough, who also owns Wainhomes, and his son Will.
Himor has retained the same management team to look after the properties owned by WR Estates, which include Bradley Hall Trading Estate in Wigan, Engineer Park in Deeside and two office buildings, Guildhall House and Norwest Court, in Preston.
Will Ainscough said: "This move is part of our long term development plan to grow Himor in the North West property market. We have plans to expand our existing portfolio through new investment and want to develop our image accordingly. As landlords, we pride ourselves on our hands on management and it is important that customers can access this quality through an established brand."