New York City-based commercial leasing management platform Hightower has secured an undisclosed amount of funding, the company announced in a blog post on its site. The investors included Newmark Grubb Knight Frank Corp; Barry Sternlicht, CEO of Starwood Capital; and Bill Rudin, CEO of Rudin Management Company. Among Hightower’s previous backers are Bessemer Venture Partners, Thrive Capital and RRE Ventures.