Welcome to this once in a lifetime opportunity in beautiful Diamond Bar. One will be challenged to find such a property currently on the market, not only in Diamond Bar, but including cities for miles around. This is a contemporary design which was completed in 2008. This grand estate begins w/a private, secure, electric gated entrance leading to a 2974 sf main home and a separate 1200 sf guest home on 2.3 acres of rolling hills. The hilltop locale is at the end of a quiet cul de sac w/far reaching vistas of snowcapped mountains, city lights, & downtown Los Angeles. A private gated courtyard leads to a double glass door entry that opens to a high ceiling foyer and captivating views from the living room. Recessed lighting and floor to ceiling windows bring in natural late morning light w/a glass tile accented fireplace to keep you warm in the winter months. You will notice rich details throughout this custom-built home, such as oversized windows, art niches, custom ceiling details, viewing balconies, & amply proportioned bedrooms & bathrooms. The home is designed w/today's open living concept of grandly sized living spaces. The living & family rooms are blended w/wide entrances & double-sided fireplaces. A luxury kitchen boasts a center island w/a vegetable sink & unmatched countertop space, all in granite. In-laws will be pampered with their own downstairs ensuite & full bathroom. A generous downstairs laundry room includes washer/dryer. The upper level of the main home encompasses the primary suite w/a sitting room or possible study & a French door to a balcony. Another bedroom & viewing deck is down the hallway. From the upper landing, a small flight of stairs brings you to a possible 4th primary suite-sized bedroom (by adding a closet, title shows 4 bedrooms). Current city rules allow an 800 sf ADU, this home has a grandfathered 1200 sf home w/all of the fine touches existing in the main home. This would be a nice place to use as your home business or office too. The property extends beyond the guest home down to the property below on Pinto Mesa Dr. Award winning schools, beautiful parks, and hiking trails make for a super lifestyle. Negotiable furniture & a quick escrow is welcomed. A golf cart would be a great way to get to the upper home! W/the garage open, a 3-point turn is possible to exit the driveway moving forward. The Italian Cypress trees are on the lot, they can be trimmed down to better the view to the Northwest.