Fit-out firm Contact One is nearing completion of the refurbishment of Bruntwood's York House in Manchester city centre.
The revamped space is due to be handed over by the end of January. Agents GVA and Colliers International have been appointed to bring the offices to market.
Building work started in October 2014 and has included creating a new entrance, reception, communal areas and office suites.
The building is at the junction of York Street and Fountain Street and is home to tenants including WYG and Big Lottery Fund. Suites range from 1,000 sq ft to 3,500 sq ft. The building totals 32,000 ft of which 10,000 sq ft is vacant.
David Thwaites, associate at GVA, said: "The redevelopment of York House will deliver some much-needed high quality office space to the prime core of Manchester. With a diverse range of suites available the building is ideally placed to satisfy demand from an increasingly active sub 5,000 sq ft market during 2015."
Brad Topps, head of city centre sales at Bruntwood, said: "As we approach the end of the extensive redevelopment of York House, we are becoming increasingly excited to be able to offer such a high standard of offices in this sought after area.
"We have already secured two new full floor occupiers with Arm Holdings and Tokio Marine and expect to have the building fully let soon after the completion of the works."
Scott Shufflebottom, surveyor at Colliers, said: "The sub 5,000 sq ft market represented 80% of deals completed during 2014 and consequently the comprehensive redevelopment of York House will meet the demand for high quality accommodation within the prime core. Floor plates of 3,500 sq ft provide new and existing businesses the opportunity to build and expand within a Grade A office environment."