tionship between the service and served spaces . Each floor can be divided into four tenants or four departments or business units all with direct access from the vertical movement and service core , depending on requirements .
Office wings are efficiently planned in response to the ideal modular structural grid which allows flexibility in space planning , and can easily facilitate change and new ways of working , depending on growth , tenant and business unit requirements , and changing infrastructure and technologies . The wings are well lit from all sides , and the high-tech façade allows good day lighting without glare . External views are maximised throughout the office space , connecting the staff to their surrounds , and offering opportunities for visual breaks . At all times , the architectural focus is on creating positive quality working environments . The services are centralised at the cores in combination with the maintenance access , ensuring that servicing can take place without disruption to the office floors . All office floors are provided with areas around the cores and stairs for heavy loads , ensuring flexibility and future-proofing for internal planning .
Trees in the atrium on the floor and the feature balcony overlooking the atrium provide human scale and soften the acoustics of the tall space .
Sustainability As part of the best-practice good business journey , the 90 Grayston building is a sustainable one which achieves a minimum of a 4-star GBCSA green building rating . A combination of sensible passive design principles and selected active technologies were used to minimise the impact of the building and its ongoing use on the environment . These include the use of a highefficiency ammonia chiller HVAC system and the harvesting of rainwater to flush toilets .
Pedestrian and Vehicular Access and Parking Vehicular access is provided from Grayston Drive . By virtue of the parking being above and below the ground , the entrance is effectively in the middle of the parking structure , improving access and circulation to parking bays .
Security and Services High-tech security including full CCTV security monitoring and secure access protocol is employed . Generators provide full back up power to the building ’ s electronic services , including air-conditioning . Water storage ensures four days of uninterrupted supply in the event of a municipal cut . A full data backbone is provided and a building management system ( BMS ) monitors , controls , and reports on the operation of the technical systems including the HVAC , lifts , security , façades ’ motorised blinds and fire detection monitoring , ensuring high-quality building operation and management response .
Landscaping A combination of internal planting to pause areas , atrium trees and roof terrace planting at the atrium level ensure that although this is a building in the heart of the business heart of Africa , nature is never far away .
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