A NEW 55 ACTIVE ADULT LIVING IN GRAND PRAIRIE, TX At Mariposa at Westchester, you'll find the best of Texas living in a luxurious community surrounded by like-minded active adults. With spacious one and two bedroom apartments equipped with energy-efficient appliances and oversized walk-in closets plus community amenities like a resort-style swimming pool and a fitness studio, Mariposa at Westchester offers you the life you deserve.