Follow I-25 S To Plum Creek Pkwy In Castle Rock. Take Exit 181 From I-25 S , Use The Right Lane To Take Exit 181 For Plum Creek Pkwy/Frontage Rd Toward Wilcox St , Take S Wilcox St And Plum Creek Blvd To Alumroot St. Regency Sales Office Is Located At 273 Alumroot Street, Castle Rock, Colorado 80104