Holiday spirits ran high and flowed at Johnson Fain in downtown Los Angeles’ Chinatown, where such commercial real estate heavyweights as John Cushman, founder of Cushman & Wakefield; his colleague, Bob Ortiz; Stuart Morkun, who heads up the Los Angeles office of Mitsui Fudosan America; and Wayne Ratkovich of the Ratkovich Co. intersected at the architecture studio’s annual holiday bash. Founded by principals Scott Johnson and William Fain, Johnson Fain has worked on projects from Los Angeles to Taiwan. In the San Fernando and Conejo valleys, Johnson Fain designed the new development replacing the former Sunkist headquarters in Sherman Oaks, and has provided comprehensive design services at Amgen Center in Thousand Oaks’ home to biotech giant Amgen Inc., since 1994. At the Dec. 11 party, Johnson Fain’s eclectic, scale model-filled offices were alive with guests munching on Filipino, Mexican and Taiwanese fare supplied by Chinatown restaurants. Johnson Fain employees such as interior designers Nicole Villamin and Rebecca Cohen mingled with guests, who included Michael Barker of Barker Pacific, Nabih Youssef of NYA.