The Cit­i­group Cen­ter in Mid­town Man­hat­tan is also known by its address, 601 Lex­ing­ton Avenue, at which it’s been stand­ing for 47 years, longer than the medi­an New York­er has been alive. Though still a fair­ly hand­some build­ing, in a sev­en­ties-cor­po­rate sort of way, it now pops out only mild­ly on the sky­line. At street … Con­tin­ue read­ing How a Student’s Phone Call Avert­ed a Sky­scraper Col­lapse: The Tale of the Citi­corp Cen­ter