the floor plate and offers panoramic views of Johannesburg . There are 1,500 parking bays provided which contribute to the Alice Lane Precinct super-basement of 3,500 cars in total .
Façade Four types of glass were used on the façade : 1 . Flush double glazed vision panel ( blue glass ): Main façade glass – cool lite st120 low e safety glass . The external face is clad with highly reflective glass assist with thermal performance and internal comfort .
2 . Flush double glazed vision panel ( white glass ): Fritted glass ( 30 % ‘ dot ’ coverage ) – solar e plus grey solar control low e safety glass . The seemingly white panels defining the end corners of the office plates consist of 6mm toughened safety glass covered with a dense , white dotted frit . Lines of varying sized dots were printed onto glass panels . The undulating streaks are suggestive of water running down a smooth surface , and no two panels are alike .
3 . Flush double glazed vision panel : External atrium and pod glazing – solar e grey solar control low e . Offsets and visually separates the office wings from the atrium and pods .
4 . Flush double glazed vision panel : Pod glazing – solar e plus clear solar control low e safety glass . In plan the organically shaped ground floor retail pods offset the linear office plates . Dark glass on the pods highlights this distinction in elevation . The selected glass have a lower u-value as well as a lower solar absorption percentage . This relates to a lower glass surface temperature which results in a reduced radiant temperature .
Blinds assist with glare and thermal comfort . In terms of Green Star requirements two IEQ-8 ( External Views ) points were targeted and achieved , as more than 80 % of the usable area has a direct line of sight to the outdoors .
Interiors An imported stretched ceiling product , Barrisol , provides lighting on every floor . Repeating bands of light on the atrium bridge ceilings are visible from ground floor all the way to the 15th floor , drawing the eye upward and accentuating the slender verticality of the atrium . At night this effect is even more powerful , and the building ’ s spatiality becomes legible from the outside .
The auditorium seems deceptively simple . The faceted ceiling and acoustic panels are a result of intense workshopping and refining of complex geometries that echo the building design .
The two service cores include 13 lifts , with six in each . Six of the total lifts are full scenic lifts and all travel at 3m / s . There are two dedicated Bowmans visitors lifts which carry clients directly to the reception on the 14th floor ; which travel at 1,5m / s . There is one dedicated Firemans ’ / Goods Lift .
Sustainability Due to the relatively narrow floorplates of the north and south wings , it was possible to give over 80 % of the usable area a visual connection to the external environment . The building ’ s form also provides good levels of daylight for building users , with over 30 % of the usable area having a daylight illuminance of at least 250Lux . This also made it possible to design a lighting power density of under 2W / m 2 per 100 Lux in the usable area .
To minimise solar heat gain through the floor plates , a high performance double glazed unit was used throughout . Internally , visible glazing was cut to 50 % by creating a solid spandrel
480 Alice Lane Phase 3