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TheTowerofwarmcolorsAboutonekilometereastofPotsdamsPlatz,walkingfromthewesttoCheckpointCharlie,whichusedtodivideBerlinbeforethebreakupoftheWall(Mauer),youareledtoaremarkablebuilding,thegiganticwallsofwhicharepaintedwithwarmcolorssuchasred,pink,orangeandsoon.ThisistheheadofficeofGSW,theHousingandUrbanDevelopmentCorporationofGermany.Theextensionwasbuiltasiftosupplementtheold17-storybuilding,whichhadbeenbuiltin1961,atthetimewhentheMauerwasbuilt.In1991,immediatelyaftertheBerlinWallcamedown,adesigncompetitionwasheldandSauerbruch-Huttonteamwasselected.Butthemunicipalauthoritieswereopposedtotheplantobuildanystructuretallerthan10stories,sotheconstructionfinallystartedin1995andwascompletedin1999aftermuchnegotiation.%nK7Y2|-3n!j:a2b/r(|'c&RCompositionofthebuildingTheGWWheadofficebuildingiscomposedoffourparts:theoldonewithasquareplanedesign(floorspace10,000m2),thedisciformPillboxcharacterizedbyitsgreenbreastwalls(1,300m2),thearcuate22-storySlice,whichisconnectedwiththeoldbuildingbyanelevator-shaft(19,000m2),andthelastonewiththestrikingblackwallswhichconnectsthethreebuildingsalongthenorthKochstrasse(5,600m2).ThegreaterpartofthesebuildingsiscomprisedofficespacesandhalfofthemareusedbyGSW,whiletherestarerented.2];c7W+w/T*H2BAimingtocutenergyconsumptionbyhalf$_5Hk7?+N5Q4B#L5w/qTheGSWheadofficeaimedtoreduceenergyconsumptiontohalfoftheenergynormallyusedbyordinaryhigh-risebuildings.Inordertoachievethispurpose,varioustechniqueswereadoptedsuchasbetterinsulation,promptingnaturalventilationinallthebuildings,reducingartificiallighting,usingthebuilding'sinherentthermalmass,andatmospherecontrolbycomputers.MakesfulluseofnaturalwindandheatofthesunTruetoitsnicknameSlice,thetowerpartofthenewbuildingformsalongplaneextendingfromnorthtosouth.Thebuilding'sfacesarequitedifferentinitseasternandwesternsections.Thearchitectsmaximizednaturalventilation,thatis,theuseofsunlightandwindsfromthenortheast,themoreprevalentpatterninBerlin,thusallowingfordirect-linearizationfromtheeasttothewestofthebuilding.,Q.c6D)U'~2I-?*ZTheconstructionofthecomputerizeddoubleskin2o+Wu5X&V8o!G3AThemosteye-catchingfeatureistheeasternglass-facade,madedoubleskinatintervalsof0.9meters.Betweenthesedouble-skinsaresuspendedverticalmovinglouvers,whicharecoloredred,pink,orangeandsoon.Thelouversaremadeof600mmwideand2900mmhighaluminumpanels,whichshutoutunwantedlightoftheafternoonsun.Theouterfacadeofthedoubleskinisfixed,buttheinnerwindowcanbeopened.Onecancontrolnaturalventilationofthefloorbycombinedmaneuveringofthewindowsontheeasternfacadeandthewindowsofthewesternfacade.Intheplan,naturalventilationisstartedwhentheroomtemperatureisfrom5to28degrees;otherwise,air-conditioningwillstartautomatically.In1999naturalventilationwasusedfor75%oftheyearandthebuildinghardlysawtheneedtooperateitsair-conditioners.Theinsideofthedoubleskinatthewesternfacadeformsaspace,whichreachesfromthe5thfloortothetopfloor.Asidefromthegratingusedforinspection,thisintegratedstructurepromptsupwardaircurrent,withthestructureworkinglikeachimney.The'wings'installedattheloftcreatesanegativepressurewhichhelpstodrawintheairintothedoubleskin.Inbothsidesofthefacade,computersoperatethewingsandlouvers(onlyatthewest)bymeansofsensors,whichmonitorthetemperatureandwindvelocity.Thecomputerprogramsarescheduledtobecomeevenmoresophisticatedwhenmoredataisaccumulated.Computers,however,havepriorityintheeasternfacade,buttenantshavemanualprioritytoopenandclosethewindowsinthewesternfacade.Glazingofthefacades*C*E5u.S$~;z7E'tInthewesternfacade,outerglasspanesare10mmtempered,innerareLow-Ewithdouble-glazing(u-value=1.4W/sqmK).Theeasternfacadeisalsoadouble-skinfacade(20cm)whichenclosesthewindowblinds.Theouterglasspanesare8mmtempered,inneraredouble-glazed(u-value==1.2-1.3W/sqmK)bottom-hingedin-swingingwindows.DataofGSWheadquarterErweiterungGSW-Hauptverwaltung&l3H;p*oO7`%@--------------------------------------------------------------------------------&x$S7M#d$|o7X'Z%g%nArchitectureAddressKochstrasse22ArchitectSauerbruchHuttonArchitekten,Berlin/London&p-WQ!^5o8}'K&Y7M7~2FCompleted1998TotalFloorArea30,000m2,~#[2g#k6Z%W7BHeight80mGlassWesternFacadeOutsidetemperedglass10mmtemperedglass#U8[1HL+m+S)Q2n1^4ZWesternFacadeInsideDoubleglazing/c:hj.U)X1[0~9tC6mmLow-Eglass+12mmair-space+8mmfloatglass-c]#f$H$s;|EasternFacadeOutsidetemperedglass8mmtemperedglass4LU-~.H1]6^:_8lEasternFacadeInsideDoubleglazing,V;u&I&[!m)N4i3i8mmfloatglass+14mmair-spacewithArgongasfilled+6mmLow-EglassAnamoebaofanindustryanddevelopmentparkTheInnovationszentrumPhotonic's(PhotonicsInnovationCenter)characteristicshapewasconstructedasapartofWISTA,inwhichtheformerairportandcenterofaircraftindustrieswouldbetransformedintoahigh-techindustrialparkofresearchanddevelopmentforoptical,electronic,andlasertechnologies.Inthedesigncompetitionof1995,theplansubmittedbySauerbruch&Huttonwasselectedtobuild,thiscomplex.ThePhotonikismadeupoftwo,amoeba-likestructures:asmallerflat-roofedbuildingforconductingexperiments,andathree-storybuildinghousingresearchlaboratories.Thebuildingsareconnectedbyanundergroun