Tall Building (ebook)

The CenterLightandMassAn eight-pointed star rises vertically on thewaterfront in the form of an ultratech office toweroverlooking Central and Victoria Harbour. Silveryand reflective by day, the monolith transforms intoa light show at twilight when its four angularprojections morph into cool neon chevrons. Thismassive office block offers the largest Grade Afloorplates in the SAR and is known — simply andauthoritatively — as The Center

When architect Dennis Lau(Chairman & ManagingDirector of his eponymous firm) talksabout The Center, the enthusiasmhe feels for the building in specificand Hong Kong architecture ingeneral becomes palpable. Heeagerly sketches responses toquestions by tearing off sheets froma roll of tracing paper, literallyretracing the design process. Ashe describes his modernreinterpretations of traditionalChinese gardens, his fingers fly tothe bookshelf, plucking a volume ofSuzhou stone masterpieces toillustrate his words. Lau’s fondnessfor the SAR, mastery of his craft andpassion for the new 80-storey officetower are much in evidence. Whenasked about possible alternatedesigns for The Center, he points tothree scale models enshrined inglass cases — all fascinating andworkable designs that ended up onthe “cutting room floor”. The finaldesign reflects Lau’s passion for hiscraft, developer Cheung Kong’sdesire for a landmark office tower,and the considerable vagaries of thesite itself.Hong Kong’s historical sliceThe Center is located in one of HK’solder districts — midway betweenCentral and Sheung Wan. The siteoffers prime vistas of Asia’s mostscenic cityscape and harbourfront,

ut was also home to a rabbit warrenof “lane communities” — shopsarranged along narrow parallellanes. Twelve years ago, the LandDevelopment Corporationearmarked the problematic site forredevelopment, but the wheels ofprogress ground on for nine yearsuntil construction finally began.Acquiring the land from a myriad oflandlords was one problem. Otherproblems were posed by thegrowing pains of urban renewal —previous redevelopment in the areahad been undertaken piecemeal,rendering a wholesale razing of thearea unfeasible.Denied a completely clear site,Lau designed the signature eightpointedstar plan of The Center tosuit the irregular environs. Thisgeometric plan can be described as“square-upon-square”. Thediamond-shaped projections alsomaximise views from every angle.Lau was interested in maintainingthe “lane community” concept,perhaps under glass canopies. TheLDC (whose logo, interestinglyenough, was designed by Lau yearsago) was more in favour of creatingcirculation space for community use.Gazing upwardLau’s creation achieves animpression of tremendous mass,which is potentiated by the urbansqueeze of its surroundings. HongKong is not known for its shy andretiring office blocks, but evencompared to other shinyheavyweights, The Center is

attleship-massive. In daylight, thebase of the building provides themost impressive view, as theinverted-pyramids of theprojections merge into the silverybuilding sides and continueskyward. At night, the projectionsare limned in horizontal chevronsof coloured light, completelytransforming the building’spresence while retaining its profile(see sidebar: “Light Show”). Theoverall impression is that of astructure which is already part ofthe next millennium — a futuristicoffice block whose appearance isin lockstep with its host of hightechfacilities.Counterbalancing this impressionof mass is the use of light within aconfined urban space. The buildingmaterials for The Center werechosen to admit or reflect light.Surfaces on the lower floors —including the twelve main columnswhich support the building frame —are largely done in embossedpatternmirror-finish stainless steelcladding. This shiny stippled steelplate is an emphatic flourish whichlends an air of polished industry.Mirror finishes are in abundance; thestructure bristles with chrome rivetsand metal detailing. Glazing is usedextensively.The building’s colossalentrances are a Dennis Lau & NgChun Man trademark. The lobby ison a similar scale; at ground level,it seems to swallow itssurroundings in every direction,including straight up. Lau pointsout that while the lobby appearsmassive, it is in proportion to theremainder of the building. A quickglance at the section drawingconfirms his point.Gaining entryThe building presents identicalfacades on all four sides, yet theentrances vary considerablydepending on the approach. DesVoeux Road Central has anentrance with a pair of escalators forthose arriving by tram, and theJubilee Street side — oppositeCentral Market — houses the mainvehicular entrance. A side entranceon Gilman’s Bazaar is approached

via a gigantic staircase finished inthat distinctive chrome stipple.The main entrance and publicdrop-off is on Queen’s Road Central,where the building is approachedacross a 1,500 sq m open plaza.This space is open to the public 24hours daily, and incorporates a“bamboo garden” which Laudesigned as a modern answer to thestone wonders of Suzhou. Glassfacades flank the plaza, which iscomplemented by a water featureand a “tree pit” stocked withflourishing green bamboo. Apedestrian corridor is defined by anoverhead awning supported by asingle row of columns; this fullyglazed canopy provides protectionduring inclement weather.

The pair of glazed doors frontingthe corridor can be difficult to notice,as one is distracted by the expansivesteel and glass of the building’s core.Persevering through those doors,the 12.4-metre main lobby revealsitself as a transparent box. Glazedpanels are supported by chromedtension cables in a vertical tensilearrangement; support is supplied bythe steel frame and structural slab.To the right is a pair of escalatorsleading down to future GI/C(Government Institution andCommunity offices), the executivedrop-off area and the singleexecutive lift, which offers securedcardaccess to any floor in thebuilding.Straight ahead, a bank of threeescalators leads upward to thetransition lobby. The escalators areflanked by “bubble tanks” — rowsof cylinders filled with water andbubbling away. A waterfall wassuggested, but it was felt thatallowing the water to drain awayfrom the building constituted badfeng shui; the bubble tanks allowthe direction of flow to continueupwards into the building. A seriesof misting devices at the base ofthe bubble tanks creates a lowintensity,soothing fountain effect.The transition lobby is a spaciousplane finished in unique grey-greenBrazilian granite (unique as thesingle quarry which produced it hasnow closed down). The lightness ofthe stone colour is singular. It is herein the transition lobby where thetransformation from the straight lines

and triangulation found in thecolumn arrangements starts to shiftinto the circular theme whichdominates the building’sinterior. A large design element ofconcentric circles appears on thefloor of the transition lobby and isechoed by a round skylight directlyabove.Directly in front of the escalatorsis the spacious glazed entrance tothe anchor tenant’s retail shop. It ishere that the slow curve of the retailarea begins. Although retail is notThe Center’s raison d’être, a seriesof shops is available for everydaytenants’ needs. Even without aburning desire to go shopping, astroll along the semicircular glazedwalkway provides wonderful viewsof the building core, columns andelevation. The curving arcade alsoscreens views of the older concretebuildings which surround TheCenter, and the semicircular spaceis topped by a landscaped gardenwhich provides further screeninggreenery.To the right of the anchor tenantshop and the arcade walkway isanother triple bank of escalatorswhich leads to the raised lobby,where the vertical transport schemebegins to take shape. As with anytrue skyscraper, lift logistics arecritical — The Center utilises a“shuttle lift lobby” at the raised lobbywhich helps to manage traffic by

shuttling passengers betweenseven lift zones. People bound forzones 1, 2 and 3 can board lifts atthe raised lobby. So too can thosebound for zone 7, the exclusiveupper zone which is directlyaccessed from this lobby.Those headed for zones 4, 5and 6 start at the center of theraised lobby, where another floordesignmotif of translucent greenconcentric circles houses watersprays and coloured lights. Thisdramatic underfloor fountain isknown as the “starburst waterfeature”. It marks the starting pointfor the lifts which whiskpassengers to the skylobby on the42nd floor.Taking the “Express”Few buildings in the world are loftyenough to require skylobbies, yetthey are an essential tool in verticaltransport management for tallbuildings. The idea is simple:passengers collectively take an“express” lift to a central location,then separate into “local” liftsserving different floors which takethem to their final destination. Theconcept is similar to commutersusing a combination of expressand local trains to reach theirindividual stops.Use of a skylobby effectivelycreates a second “main lobby” areawithin The Center, albeit one withrather more spectacular views. Thearchitects have taken full advantageof the skylobby by siting a five-starfood and beverage outlet at thisjunction. A restaurant with fullglazing wraps itself around half ofThe Center, bookended by a pair oflounges for those simply enjoying adrink or a fine Havana — the facilityhas an impressive cigar menu tocomplement their beverageselection. There are a pair of officeunits available on this floor as well.The Center’s office zenith is thepenthouse on the 80th floor, whichpresents a stunning 360-degreeview akin to that from a low-flyinghelicopter.Acres of silverThe silver metallic sheen of thecurtain wall defines the building indaylight hours, and stands in sharpcontrast to its luminescent nighttimeprofile. As might be expected, thechoice of curtain wall was not anarbitrary one — with no sunshadingto speak of and a huge surface area,The Center relies on its envelope tocut solar gain and keep a damperon tenants’ energy bills. Typical unitsare Varicon 17.5 mm silver-on-clear,a configuration which limits solartransmittance to a mere 8%.Spandrel units have a 10 mmthickness and a horizontally stripedpattern. Mullions are finished innatural anodised aluminium.

Befitting its high-tech image, TheCenter employs a curtain wallcleaning system which is fullyautomated. The cleaning gondolasdescend from the top of the buildingon tracks concealed within themullions. Cleaning can be carriedout at night to minimise disturbanceto the building occupants.Technological ImplementationGrade A office space necessitatesdesign which reflects currenttechnology and allows tenants toimplement their own technology. Asour working lives become morecomplicated, the function of officetechnology should be to make ourexistence simpler and morerewarding.Raised flooring is now a standardfeature in new office buildings;Companies are loathe to move intooffices which offer no flexibility fortheir IT cabling requirements. Inaddition to its raised flooring, thestructural cabling system (SCS) forThe Center plays a critical role in alltelecommunication systems,providing the physical link betweensources and destinations ofinformation. Data, voice, video andAt 346 metres to the top of the mast, TheCenter is the third-tallest building in HongKong. Central Plaza, also designed byDennis Lau & Ng Chun Man, is 374metres tall by the same measurementstandard. IM Pei’s Bank of China Buildingtops out at 368.5 metres.59 floors of offices are available, with atotal GFA of 130,032 sq m of office space.The Center is the largest-scale steelframedoffice in Hong Kong. A total oftwelve steel box section columns supportthe building — the columns are concretefilledfor 20 storeys, then reduce in sizeand become hollow as they reach the top.At 2,415 sq m, the floorplates in TheCenter are the largest amongst all officebuildings in Central.A total of 35 high-speed passenger liftsand 6 service lifts form the verticaltransport network for The Center.Over 400 carparking spaces are availablein the basement carpark.Completion date: 1998FAST FACTS

control signals are transmitted overthis infrastructure, which linksdevices throughout the building.The SCS consists of Category 3/Category 5 (UTP) copper cables andoptical fibre cables, and is capableof supporting high-speed/broadbandservices such as ISDN lines forvoice, 100 Base-T Ethernet for data,and video signals, and is designedto accommodate futuretechnologies. Tenants can easilymake multi-floor connections, andit’s even possible for tenants toconnect on alternate floors. CheungKong’s Senior Project ManagerGrace Shen details the mainadvantage of designing the buildingfor IT use: “With The Center, youdon’t need to spend much moneyfor interior fit-out.”Flexible AirThe 340 mm underfloor void of TheCenter is unique in that it houses anair-conditioning system withrelocatable air diffusers built into thefloor. This is the first air plenumsystem in Hong Kong — the voidunderneath the floor is filled withcold air which is piped into theworking space via individualunderfloor units. This design allowsfor maximum flexibility as the air-conunits (the units interchange with floortiles and are thus known as “fantiles”)can be installed or removedas needed. This eliminates the needfor ductwork and allows officepartitions to be reconfigured easily.The system permits end-users toadjust temperature and volume of aircirculation to suit personal tastes, orto compensate for heat-generatingequipment.Air circulation in each office isfurther improved by a ceilingmountedrecirculating air systemand air-filtering system which routes

the air return through theinterchangeable light reflector unitsin the ceiling. Shen: “It’s all aboutuser control and keeping the airclean. The underfloor spaceprovides ease of maintenance as itis simple to vacuum.”The building also bristles withtechnological frills at the public level.LCD screens in the passenger liftsdisplay weather data and can beprogrammed with the company logofor firms leasing an entire floor.Touch-screen directories are locatedin the office lobby, while lobbyscreens display financial data,weather and news headlines. Thetrump card is the huge SonyJumbotron display screen on theQueen’s Road Central side, whichpresents newsfeed information andcan also be used for special events.Cheung Kong (Holdings) Ltd /Land Development CorporationdeveloperDennis Lau & Ng Chun ManarchitectMaunsell Consultants Asia Ltdstructural engineerAssociated Consulting Engineers Ltdm&eDavis Langdon & Seah (Hong Kong) Ltdquantity surveyorsPaul Y - ITC Construction Ltdmain contractor

Light ShowThe night-lighting features of TheCenter are so dramatic that theyhave become a symbol of thebuilding itself. They have been therecipient of praise and scorn, butmore than anything else, they haveplaced an indelible stamp on HongKong’s famed nighttime skyline. Insharp contrast to the normal practiceof training spotlights on a buildingto articulate its curtain wall, fins andornamentation in the night hours,The Center’s neon scheme leavesthe walls of the building dark as benthorizontal stripes climbs thepyramidal projections of theelevation, culminating in atrapezoidal flurry of lumens at thebuilding’s crown.The lighting scheme was suppliedby Far Display Lighting Ltd, asubsidiary of Hong Kong-based FarEast Neon Light Co Ltd. The systemis a COZY ® VIVID low-voltage neonsystem which uses primary-colourneon tubes to achieve a wide varietyof effects. The 8,784 tubes areevenly divided between red, blueand green; combinations of thesecolours will create any desiredcolour. The total power consumptionis approximately 110,000 watts,although a conventional highvoltageneon system of identical sizewould consume four times as muchelectricity. About 11 kilometres ofneon tubing was used.The system has a total of 14preset settings, three of which aresolid-colour and can be used forchecking the entire lighting system.The everyday presets involve slowand subtle changes, which alwaysmove from bottom to top,accelerating the upward thrust.There are presets for holidays — theChristmas effect will evoke a greenand yellow Christmas tree with multicolouredsparkles, and the LunarNew Year setting will alternate red/gold/yellow/green with bloomingrainbow colours. The most dynamiclighting effect is where the buildingimitates a fireworks display going off,with rapid colour rushes toward thetop followed by slower particles ofsparkling colour falling downwards— an effect that will manifest duringpyrotechnic displays in the harbour.Currently, the system presents asingle “fireworks” cycle at 9:00 PMand a single “holidays” cycle at10:00 PM.Working in unison with theneon lighting is a series of Italianspotlights known as “spacecannons”. This particular chargeof the light brigade takes placemostly at the top of the building,where space cannons in 4,000-,2,000- and 1,000-wattconfiguration light up the rooftopmast with its double-paraboladecoration. An additional quartetof space cannons will train 4,000watts of firepower on the lowerportion of the building. All ofthese ultra-tech spotlights arewired into the main system andwill change colour as required.