A £7.5m scheme at the Royal Exchange House for Esson Properties is one of two projects the contractor has secured on Queen Street.
The second project involves ISG commencing a fit out programme for a professional services firm at 110 Queen Street.
The company will also undertake a £2.3m scheme for Whiteburn Projects in West George Street.
Royal Exchange House will undergo significant structural strengthening, allowing ISG to develop two additional floors totalling 10,000 sq ft of new office accommodation at roof level on the six-storey structure.
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A Cat A fit out will also be carried out on the existing open plan office accommodation.
For the second project, ISG will begin a fast-track programme to fit out new office accommodation on the client's building's fifth floor. The company will replace and upgrade mechanical and electrical services, completing an internal fit-out and reconfiguration of the existing space.
Work is already underway on the third project at 100 West George Street.
The company is carrying out a major refurbishment of the existing six-storey office building. Over 19,500 sq ft of office accommodation will be created across the upper four floors.
Space will be prepared on the lower ground and upper ground floors to allow a restaurant to be built.
ISG will also remodel and refurbish the entrance and reception areas.
Andy McLinden, ISG's Scotland regional managing director, said: "There are encouraging signs of growth in the Glasgow office market and securing three projects in such close proximity underlines this positive sentiment. Reinvigorating existing property assets by increasing capacity, remodelling and upgrading accommodation will be a key trend moving forward and ISG is well positioned to take an increasing share of this growing market."
(LM)
