This coworking space in Kirby Street, London is located inside a 1970's structure. It has been refurbished in 2017 making it completely light from the ground floor. Also, the direct light does not heat the environment, it has been made sure that that it has enough thermal insulation and windows and a rooftop garden for rainwater harvesting.
If you are looking for such an efficient space that to price effective, then this is the place to be in.