L.A. skyline-helipad roofs

http://www.latimes.com/local/cityhall/la-me-skyline-roofs-20140930-story.html#page=1

http://la.curbed.com/tags/helipads

http://la.curbed.com/archives/2013/02/new_wilshire_grand_will_be_the_west_coasts_tallest_tower.php

http://brighamyen.com/2013/02/07/renderings-revealed-new-1100-foot-wilshire-grand-tower-in-downtown-los-angeles

http://en.wikipedia.org/wiki/List_of_tallest_buildings_in_Los_Angeles#Tallest_buildings

urban