The owners of the One Kendall Square office, retail, and cinema complex in Cambridge are putting the property up for sale, seeking to cash in on rising demand for real estate in the fast-growing district.

Beal Cos. and Rockwood Capital are hoping to get upward of $360 million for the nine-building complex, which includes offices, laboratories, eight restaurants, a parking garage, and the Kendall Square Cinema. They paid $210.5 million for the complex in 2006, and have since made more than $64 million in improvements.