701 Kilbourne "THE GARDEN PENTHOUSE" | ICONIC MID-CENTURY MODERN ESTATE IN PRESTIGIOUS SAN ANTONIO HEIGHTS. Located in the prestigious foothills on a peaceful cul-de-sac, this timeless Mid-Century Modern residence offers privacy, character, and sweeping city light views. Originally designed in 1963 by iconic builder/designer D.W. Henderson, a "Gold Medallion Idea Home", the residence blends Mid-Century Modern, California Ranch, and New Formalist influences throughout its thoughtfully designed single-story layout. Light-filled living spaces feature expansive windows, original character details, a raised hearth fireplace, and seamless indoor-outdoor flow ideal for both entertaining and everyday living. Situated on an expansive nearly 1/2 acre lot, the property offers mature landscaping, tranquil outdoor spaces, room for future enhancements, and a peaceful estate-like setting. Additional highlights include a private primary suite retreat, separate office/art studio/guest room, indoor laundry, attached two-car garage, central HVAC, and proximity to hiking trails, parks, dining, and highly regarded schools, presenting a rare opportunity to own a true piece of Southern California architectural history in one of Upland’s most desirable neighborhoods! Drive by Today!!