April 16 (Bloomberg) -- What does an office say about a company? Bloomberg's Stephanie Ruhle goes inside the offices of the hottest tech companies in Manhattan to see what their space tells us about the direction of these companies -- starting with Tumblr. Tumblr has grown up since it moved into its current Manhattan office in 2010. CEO David Karp strives to keep a family vibe at Tumblr headquarters. But how is he making that happen as he transitions from start-up to a mature company all under the watchful and demanding eye of its parent company Yahoo?