A venture of Randy Rissman, who sold Tiger Electronics to toy giant Hasbro nearly two decades ago, has struck a preliminary deal to buy the 31-story office tower at 150 N. Wacker Drive.

Rissman is now managing director of Leo Capital Holdings, a venture capital firm he founded in 2000. The Northbrook-based firm invests in “early and later stage private companies,” with a focus on consumer-oriented technologies, according to its website. Grubhub, which is now publicly traded, is listed among Leo Capital’s investments on its site.

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