Tata Group headquarters 'Bombay House' has been given “green rating” by a leading agency for implementing measurable strategies and solutions in five categories -- site and facility management, water efficiency, energy efficiency, health and comfort and innovation, the company said Monday.

Bombay House, located in the commercial capital city Mumbai, was built in 1923. It is the headquarters of the Tata Group that comprises over 100 operating companies in seven business sectors -- communications and information technology, engineering, materials, services, energy, consumer products and chemicals.