Bruntwood has completed a series of refurbishment works at Oriel Chambers in Liverpool.
A highlight of the £500k works is the transformation of the fifth floor into a contemporary breakout and meeting space known as the Lookout, with views across the Liverpool skyline.
A series of bespoke new suites, ranging from 150 sq ft to 1,100 sq ft have been established as part of the work, many of which have already secured lettings.
Several new communal spaces have also been created, while the Grade 1-listed building's iconic reception area has undergone a major refurbishment.
Designed by architect Peter Ellis and built in 1864, Oriel Chambers was the world's first building to feature a metal framed glass curtain wall and is renowned as the inspiration for many of the world's earliest skyscrapers, notably in Chicago and New York.
Tony Reed, head of sales at Bruntwood, said: "Oriel Chambers remains one of Liverpool's finest office addresses and continues to attract business occupiers across a range of sectors.
"As custodians of this unique building, it's vital that we preserve its longevity by consistently renewing certain features to ensure a modern, vibrant workspace.
"The new communal areas will add to the sense of community that already exists here and we have already several strong enquiries linked to the Lookout space."