CAMBRIDGE, MASS. — SmartLabs, which designs, builds and operates multifunctional labs, will open a 140,000-square-foot flexible lab and office space at CambridgeSide, a mixed-use mall redevelopment located across the Charles River from Boston. The spaces will be located on the third floor and will be customizable to accommodate life sciences companies from fewer than 10 to more than 100 employees. The facility, which will be the fourth in the Boston area for SmartLabs, is slated to open in late 2024. A partnership between New England Development and a client advised by UBS Asset Management owns CambridgeSide.