Editing Tate Modern (section)

==== The Switch House ====
[[File:Tate Modern Switch House (27633103611).jpg|thumb|Exterior of the Switch House]]
A ten-storey tower, {{convert|65|m|abbr=on}} high from ground level, was built above the oil tanks.<ref>{{cite web|url=http://www.tate.org.uk/file/tate-modern-project-environmental-statement-non-technical-summary|title=Environmental Statement non-technical summary|work=Tate Etc.|access-date=25 September 2014}}</ref>

The original western half of the Switch House was demolished to make room for the tower and then rebuilt around it with large gallery spaces and access routes between the main building and the new tower on level 1 (ground level) and level 4. The new galleries on level 4 have natural top lighting. A bridge built across the turbine hall on level 4 provides an upper access route.<ref name=guide />

The new building opened to the public on 17 June 2016.<ref>{{cite web|url=http://www.tate.org.uk/whats-on/tate-modern/special-event/new-tate-modern-opening-weekend|title=The new Tate Modern opening weekend – Special Event at Tate Modern|website=Tate Etc.|access-date=18 June 2016}}</ref>

The design, again by Herzog & de Meuron, has been controversial. It was originally designed with a glass stepped pyramid, but this was amended to incorporate a sloping façade in brick latticework (to match the original power-station building)<ref>{{cite web|url=http://www.worldarchitecturenews.com/index.php?fuseaction=wanappln.projectview&upload_id=10122|title=Tate Modern extension redesigned|publisher=Worldarchitecturenews.com|date=18 July 2008|access-date=8 January 2013}}</ref> despite planning consent for the original design having been granted.<ref>{{cite web|url=http://legacy.london.gov.uk/mayor/planning_decisions/strategic_dev/2007/20070509/tate_modern_bankside_report.pdf|title=Tate Modern extension, Bankside|publisher=Greater London Authority|access-date=25 September 2014|archive-url=https://web.archive.org/web/20120819083439/http://legacy.london.gov.uk/mayor/planning_decisions/strategic_dev/2007/20070509/tate_modern_bankside_report.pdf|archive-date=19 August 2012|url-status=dead|df=dmy-all}}</ref>

The extension provides {{convert|22,492|sqm|abbr=on}} of additional gross internal area for display and exhibition spaces, performance spaces, education facilities, offices, catering and retail facilities as well as a car parking and a new external public space.<ref>{{cite web|url=http://www.inexhibit.com/case-studies/tate-modern-expansion-herzog-de-meuron/|title=Tate Modern extension by Herzog & de Meuron architects|publisher=Inexhibit|access-date=25 September 2014}}</ref>

In May 2017, the Switch House was formally renamed the Blavatnik Building, after Anglo-Ukrainian billionaire Sir [[Leonard Blavatnik]], who contributed a "substantial" amount of the £260 million cost of the extension. Sir [[Nicholas Serota]] commented, "Len Blavatnik's enthusiastic support ensured the successful realisation of the project and I am delighted that the new building now bears his name".<ref>{{cite web|author=Hannah Ellis-Petersen |url=https://www.theguardian.com/artanddesign/2017/may/04/tate-modern-names-extension-after-oligarch-donor-len-blavatnik |title=Tate Modern names extension after billionaire Len Blavatnik |work=The Guardian |date=4 May 2017 |access-date=30 June 2017}}</ref>