DETAILED plans have been drawn up to double the size of a Glasgow city centre office building.

Extra floors would be added to 150 St Vincent Street, which currently offers 69,000 sq ft across eight stories.

A design statement submitted with the application explains: “The project brief is for a full back-to-frame refurbishment and extension to the back of the site in order to provide circa 151,000 sq ft of Grade A office space. The provision of roof terraces is included in the new development, as well as amenity spaces such as cycle storage and a gym.

“Additional stories are stepped back on the upper floors to allow large roof terraces for the tenants that maximise the views across the city. The rooftop extension is intended to grow out of the rear block and allows the building height to broadly align with the Beacon building on the opposite corner of Wellington Street.”

The statement continues: “The renewed office building will be an attractive improvement to the central business district and Blythswood area of Glasgow City Centre, aligning with Glasgow City Council’s aspirations to establish a modernised identity to the area.”

The building was completed in 1976 and used as the Former Scottish Amicable Life Assurance Society HQ before becoming lettable office space in 1996.

The application by St Vincent Property Ltd is pending consideration by city planners.