Crain’s New York Business: New York City’s burgeoning technology companies have helped pace an 8.4% rise in the total square footage leased in the 50 largest commercial office deals last year, to 14 million square feet. Tech firms, led by Amazon, BuzzFeed and Twitter, accounted for seven of the top 50. Among them, they inked deals for 1.3 million square feet of space. More broadly, tech, advertising and media firms accounted for 16 of the top 50, and 32% of the total space leased.