london u.s. embassy london move next month new billion-dollar home overlook river thames u.s. president donald trump action place strain special relationship britain unite state britain close ally leave behind impose 1960 stone concrete embassy london upmarket grosvenor square area know little america world war two square also house military headquarter general dwight d. eisenhower old embassy also focus british discontent u.s. policy anti-vietnam war protest 1960s draw thousand britons include celebrities day like roll stone frontman mick jagger new 12-storey build south bank river heart huge regeneration project former industrial zone know nine elms set become urban park open business jan. 16 host 800 staff 1,000 visitors day embassy look windows reflect global outlook u.s. go forward 21st century rather look look say woody johnson trump appoint u.s. ambassador britain u.s. state department run competition design new build 2008 billion construction wholly fund sale properties london glass structure give form core democratic value transparency openness equality state department brief document say inside cube visitors greet impose stone facade feature bald eagle unite state great seal embassy also design exact security specifications set back least 100 feet 30 meter surround build mostly newly-erected high-rise residential block incorporate live quarter u.s. marines permanently station inside new office though signify new era friendship two countries president trump want us work closely ever uk johnson say british relationship former colony broad political cultural military alliance forge last century exercise battlefields around world test recent months prime minister theresa may first foreign leader visit white house trump surprise election november 2016 use trip invite full state visit two leaders commit strengthen trade link speak regularly governments disagree several issue trump decision decertify iran compliance multilateral nuclear deal move recognize jerusalem capital israel possible state visit trump remain contentious issue among britons lawmakers campaign group call offer rescind promise take streets protest come britain right protest basic right country country express one view well within bound reasonableness johnson say say hop trump could attend as-yet unscheduled open ceremony new build firm plan place month may publicly criticize trump reposting british far-right anti-islam videos twitter account respond rebuke tell may focus islamic extremism britain u.s. prepare open doors billion-dollar london embassy