See Inside: Biggest Home For Sale Right Now In MetroWest

SUDBURY, MA — The average size home in the United States is about 2,600 square-feet, according to the U.S. Census Bureau. This Sudbury mansion is almost five times that big.

At 12,000 square-feet, this Dutton Road home is the largest for sale right now between Framingham and Worcester. It features all the amenities you'd expect, like an enormous chef's kitchen and a generous five-acre lot. There are also some curveballs, like an underground tunnel connecting to the garage, and a two-story family room. Here are the details:

• Address: 145 Dutton Rd, Sudbury, Massachusetts
• Price: $4,000,000
• Square Feet: 12365
• Bedrooms: 5
• Bathrooms: 6 Full and 2 Half Baths
• Built: 2008
• Features: Absolutely exquisite custom built estate on over 5 private, manicured acres off scenic Sudbury country road. This home boasts the highest level of craftsmanship, unmatched attention to every detail, and an easy, family friendly floor plan that beautifully blends privacy and great entertaining space. Dramatic two story foyer welcomes you,open to banquet sized dining room, custom chefs kitchen with pizza oven and butlers pantry is perfect for entertaining (three refrigerators, three ovens, three dishwashers).The two story family room with stone fireplace is magnificent with its exposed beams and unique windows.First floor office and bedroom suite with kitchenette.Take the elevator upstairs to the second master suite which includes a sitting room and stunning masterbath with oversized shower.Three more bedrooms all en suite. Fantastic game room. Laundry room with two sets of w/d. Underground tunnel from house to garage leads to a 12+ car garage with three floors.Car collectors take note!

This listing originally appeared on realtor.com. For more information and photos, click here.