The Federated Indians of the Graton Rancheria are expanding California’s Graton Resort & Casino, adding 200 guestrooms, a “luxurious spa,” plus a meeting and convention space in a US$175 m (€155m, £113m) project.

The 342,000sq ft (31,773sq m) addition will expand the amenities at the existing US$800m (€710m, £517m) casino and entertainment facility that opened in November 2013.

Located just north of San Fransico, the Graton Resort & Casino is owned by the Federated Indians of Graton Rancheria and managed by Station Casinos.

Designed by Friedmutter Group, the six-storey hotel will connect to the south side of the existing facility, and is anticipated to open in late 2016.