The prosperity of Cement was not to last. As the limestone deposits were depleted, the industry in Cement began to decline, and the town's economy began to suffer.
Over time, the population of Cement continued to drop, and many of the towns businesses and services were forced to close. The town was finally sold off in 1927 for only a few thousand dollars. The once-thriving town became a shadow of its former self, and today it is a ghost town. The ruins of the town, including remnants of the old cement mill and the foundations of abandoned homes and buildings, stand as a testament to the once-prosperous community that was a center of the cement industry in California. The most prominent and visible concrete ruin on Cements hillside is large and referred to locally as "The Castle." The Castle can be seen all the way from Interstate 80 in Fairfield.