Editor's note: This is one in a series of articles celebrating the first 100 years of the city of Roseville. In a little more than 10 years, Kaiser Permanente has turned a modest presence into the city and county’s largest employer. The health-care giant saw patients for years at its Riverside Avenue medical offices, but lacked a full-service hospital in the region’s most booming city. That changed in 1995, when construction was completed on Kaiser’s Eureka Way campus. But due to flat membership, it sat closed until 1998. At that time, it included an acute care hospital, emergency room, and surgical facilities. But membership didn’t stay sluggish for long. It boomed in the 2000s. And in recent years, Kaiser has embarked on a massive expansion to add bed capacity and services. In late 2008 and early 2009, Kaiser opened a much larger emergency room, making it the largest in the region. And in January, members received another boom: a birth center to replace a decades-old facility in Sacramento. The nonprofit HMO estimates it will have spent a half-billion dollars on new projects in the area when all tallied.