Philadelphia is becoming a millennial haven.

The city’s millennial (eighteen to thirty-four years old) residential base has risen by 135,000, or 41.5 percent since 2005, the largest increase among the ten largest American cities, according to 2016 research by consultant JLL.

City builders are designing the city to attract young people to stay, with entertainment, healthy foods, fitness options, discount shopping, and advertising through social media. The millennial playbook explains the rise in places like Honeygrow, Sweetgreen, SoulCycle, Nordstrom Rack, and the Outlet Store.

East Market is a huge project aiming to court millennials, set to open next summer.

“The increase in millennials choosing to live, work, and create in Philadelphia is wonderful for our city,” Dan Killinger, managing director of development for D.C.-based National Real Estate Development building East Market, told the Philadelphia Inquirer.

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