Boulder, CO Homes for Sale with Acreage

• 

  

  

  /15

  $875,000

  • Land
  • 1.34 Acres
  • $652,985 per Acre

  6109 Red Hill Rd, Boulder, CO 80302

  Welcome to a unique opportunity at 6109 Red Hill Road, where expansive views and the serene beauty of nature await. This remarkable piece of land offers a blank canvas for your vision, whether you're dreaming of constructing a custom residence or investing in a future project. There is an approved Boulder County Site Plan on this gem, putting you way ahead in the building process. There are also

  David Mans Compass - Boulder

  6109 Red Hill Rd, Boulder, CO 80302
• 

  

  

  /36

  $1,050,000

  • 4 Beds
  • 3 Baths
  • 2,748 Sq Ft

  208 Wild Tiger Rd, Boulder, CO 80302

  Welcome home to this outstanding A-frame located in the majestic Sugarloaf area in Boulder. This outstanding 4 bedroom 3 bath home sits on a little more than an acre. Upon entering you are greeted with stunning marble floors and an abundance of natural light. The open concept floor plan features a newly remodeled kitchen complete with slab granite countertops, soft-close drawers, stainless steel

  Autumn White Porchlight RE Group-Boulder

  208 Wild Tiger Rd, Boulder, CO 80302
• 

  

  

  /33

  $3,846,000

  • 9998 Beds
  • 8480 Baths
  • 7,893 Sq Ft

  1850 Folsom St Unit 5 Units, Boulder, CO 80302

  This is an unparalleled investment opportunity in the Horizon West Building. This portfolio of five residences in this rare and lucrative enclave offers breathtaking, unobstructed panoramic views from every unit, and a phenomenal location where you can walk to dining, trails, and shops. Residents indulge in top-tier amenities, including a fitness center, swimming pool, a rejuvenating hot tub, a

  The Bernardi Group Coldwell Banker Realty-Boulder

  1850 Folsom St Unit 5 Units, Boulder, CO 80302
• 

  

  

  /23

  $1,599,000

  • Land
  • 2.22 Acres
  • $720,270 per Acre

  8 Benchmark Dr, Boulder, CO 80303

  Enchanting Property with Sweeping Views of the Entire Rocky Mountain Range. Welcome to a place where dreams take root and every sunset feels like a painting. Perched high above the Boulder Valley, this extremely special property offers a once-in-a-lifetime opportunity to build your dream home in one of Colorado’s most breathtaking locations. Set at the end of a quiet cul-de-sac and bordered by

  Nancy Bible Corcoran Perry & Co.

  

  8 Benchmark Dr, Boulder, CO 80303
• 

  

  

  /27

  $1,020,000

  • 4 Beds
  • 3 Baths
  • 2,506 Sq Ft

  67 S Peak Rd, Boulder, CO 80302

  Come home to South Peak and take in majestic views from this 4 bedroom mountain, contemporary home. Located minutes from Boulder amid gardens, wildlife and the ever-present feeling of peace and contentment. The owners just completed an extensive remodel, costing over $400,000 including electrical, plumbing and high efficiency, radiant heat. The mountain modern interior boasts new kitchen

  Liz Ford Ford & Co. Realty

  67 S Peak Rd, Boulder, CO 80302
• 

  

  /6

  $4,495,000

  • Land
  • 9 Acres
  • $492,873 per Acre

  1085 S Cherryvale Rd, Boulder, CO 80303

  Exceptional opportunity. A 9 acre estate awaiting your vision for the creation of personalized rural living experience. Kick back on the native prairie jutting into the City of Boulder's protected Open Space highlighted by completely unobstructed panoramic views of the Flatirons, the City of Boulder, the Continental Divide and Longs Peak. Perhaps the most desirable building site in Boulder

  Robert Grotluschen RE/MAX of Boulder, Inc

  1085 S Cherryvale Rd, Boulder, CO 80303
• 

  

  /36

  $1,025,000

  • 3 Beds
  • 2.5 Baths
  • 2,420 Sq Ft

  82 Grove Ct, Boulder, CO 80302

  Elevated. Inspiring. Trailside. This Boulder Heights home is designed for those who want to live in tune with nature without sacrificing convenience. Set on a sprawling lot with expansive foothill views, it offers the perfect balance of privacy and access, with trails just outside your door and downtown Boulder only five miles away. Inside, thoughtful updates shine-fresh interior and exterior

  Alex D'Allaird LIV Sotheby's Intl Realty

  82 Grove Ct, Boulder, CO 80302
• 

  

  /40

  $5,400,000

  • 5 Beds
  • 3.5 Baths
  • 5,337 Sq Ft

  1000 Spring Dr, Boulder, CO 80303

  Step into 1000 Spring Drive, a luxurious retreat embraced by nature, offering breathtaking views in every direction. This timeless architectural masterpiece designed by tkp Architects seamlessly blends contemporary elegance with organic details, creating a sanctuary in perfect harmony with its surroundings.Meticulous attention to detail throughout this five bedroom refined and inviting home

  Chally Wiener Compass - Boulder

  1000 Spring Dr, Boulder, CO 80303
• 

  

  /17

  $1,480,000

  • Land
  • 6 Acres
  • $244,224 per Acre

  7366 Empire Dr, Boulder, CO 80303

  This is a fantastic piece of land located in the heart of Boulder County. 360% views with spectacular views of the foot hills and back range, Longs Peak, Arapaho Ridge, Mount Audubon, and much more. Spanish Hills/ Panorama Park is conveniently located off of South Boulder Road and 76th St. with easy access to Boulder, Denver, DIA, Louisville, Lafayette, the mountains, ski areas and so much more.

  Joel Thompson RE/MAX Alliance-Boulder

  7366 Empire Dr, Boulder, CO 80303
• 

  

  /38

  $1,650,000

  • 3 Beds
  • 2 Baths
  • 2,259 Sq Ft

  718 Emerson Gulch Rd, Boulder, CO 80302

  Nestled in the hills above Boulder rests an architectural masterpiece. Built into the surrounding landscape and overlooking Four Mile Canyon and Sugar Loaf Mountain, lies the modern, private retreat you have been waiting to call your home! In this fully furnished, turnkey property, you will be just minutes from town, yet tucked away from everything. Nearly fifteen years of new vegetation has

  Jon Paul Matzke Blue Yeti Homes

  

  718 Emerson Gulch Rd, Boulder, CO 80302
• 

  

  /34

  $1,495,000

  • 3 Beds
  • 3.5 Baths
  • 3,712 Sq Ft

  84 Canon View Rd, Boulder, CO 80302

  Nestled in the breathtaking Boulder Heights community, this exceptional home offers panoramic views that stretch from the city of Boulder to the plains, and even the distant skyline of Denver. The home is thoughtfully designed to capture the gorgeous views with expansive windows throughout - perfect for watching the sunrise in the morning and the lights twinkling at night. The home has a

  Beth Goltz WK Real Estate

  84 Canon View Rd, Boulder, CO 80302
• 

  

  /20

  $197,174

  • 3 Beds
  • 1 Bath
  • 854 Sq Ft

  4855 Edison Ave Unit 112, Boulder, CO 80301

  Affordable Housing property through Thistle. the proud owner of this charming ground-floor unit in the desirable Sunnypoint Condos! With 3 beds and 1 bath, this home offers modern comfort and efficient use of space. Come inside to find an open-concept floor plan showcasing an inviting living room with a cozy fireplace for chilly nights! The neutral palette creates a welcoming atmosphere,

  Nick Ahrens eXp Realty, LLC

  

  4855 Edison Ave Unit 112, Boulder, CO 80301
• 

  

  /40

  $3,900,000

  • 4 Beds
  • 5 Baths
  • 4,184 Sq Ft

  1866 Park Lake Dr, Boulder, CO 80301

  Gracefully set in one of Boulder's most desired neighborhoods, this one-of-a-kind home offers panoramic Front Range Mountain views & exceptional privacy, just minutes from downtown Boulder. The open architecture features a 1500sf atrium great room with two 25' trees surrounded by windows that frame the mountain views. With over 5500 sf of finished space on three levels, the home offers one level

  The Bernardi Group Coldwell Banker Realty-Boulder

  1866 Park Lake Dr, Boulder, CO 80301
• 

  

  /40

  $1,595,000

  • 3 Beds
  • 3 Baths
  • 2,582 Sq Ft

  333 Antler Dr, Boulder, CO 80302

  Amazing mountain oasis set on 10 acres bordering Roosevelt National Forest. Located just 15 minutes from Downtown Boulder, this luxurious mountain oasis features an open floorplan on the main level, expansive mountain views, and bountiful natural light. Take in the brand-new teak hardwood floors, 500+ feet of deck, and wood-burning fireplace in the living room with a vaulted ceiling. The home

  Dunbar Hardy Porchlight RE Group-Boulder

  333 Antler Dr, Boulder, CO 80302
• 

  

  /40

  $3,750,000

  • 3 Beds
  • 3 Baths
  • 3,766 Sq Ft

  4702 Eldorado Springs Dr, Boulder, CO 80303

  2.5 Acres PLUS 26.3 acres included as conservation easement. Find inspiration and privacy at this unique, one of a kind property located in Eldorado Springs, the home sits proudly at the top of a mesa, situated to take in AMAZING, SWEEPING PANAROMIC VIEWS! The views are jaw-dropping. Built rock solid, this quality property offers 3 bedrooms, the Primary Suite is oriented on the west side to wake

  Stu Wright WK Real Estate

  4702 Eldorado Springs Dr, Boulder, CO 80303
• 

  

  /50

  $2,999,000

  • 5 Beds
  • 3.5 Baths
  • 4,625 Sq Ft

  2857 Linden Dr, Boulder, CO 80304

  Welcome to one of the most walkable lots in Pine Brook Hills. There is plenty of flat space for the kids to play and enjoy their time outside. Indulge in private luxury living in this 5-bed, 4-bath home on a 1.5-acre lot. This residence is located near Broadway and CU Campus in the coveted Pine Brook Hills and offers an idyllic sanctuary. Meticulously remodeled interiors blend style with natural

  Thomas Krause Dominion Realty Group LLC

  

  2857 Linden Dr, Boulder, CO 80304
• 

  

  /17

  $199,000

  • Land
  • 1.25 Acres
  • $159,200 per Acre

  485 E Kelly Rd, Boulder, CO 80302

  Design your ideal home just minutes from downtown Boulder, located on a county maintained paved road in the sought-after Tall Timbers enclave of Sugarloaf, embraced by the scenic foothill mountains. Create your sanctuary in this idyllic setting, where nature meets luxury, offering the perfect blend of tranquility and accessibility. This parcel boasts diverse topography, approved by Boulder County

  Jackie Jones RE/MAX Alliance - Nederland

  

  485 E Kelly Rd, Boulder, CO 80302
• 

  

  /20

  $1,295,000

  • 4 Beds
  • 3 Baths
  • 2,821 Sq Ft

  1406 Pika Rd, Boulder, CO 80302

  Nestled in the heart of the mountains, this newly remodeled 4-bedroom home, blends contemporary elegance with nature’s beauty. Featuring quartz countertops, smart appliances, and soaring high ceilings. Every detail has been thoughtfully designed for comfort and style. The electric fireplace adds a cozy ambiance, while the spacious dining room is perfect for entertaining. Step outside onto the

  Roxana Rodriguez Megastar Realty

  

  1406 Pika Rd, Boulder, CO 80302
• 

  

  /33

  $799,000

  • 3 Beds
  • 2.5 Baths
  • 1,663 Sq Ft

  342 Brook Cir, Boulder, CO 80302

  Stunning Remodeled A Private Mountain Retreat- Priced to sell!!Discover an exceptional opportunity to own a beautifully updated open floor plan home in the coveted Boulder Foothills, just 12 minutes from North Boulder. Nestled on a lush, expansive lot with views of mature trees and a peaceful seasonal stream, this home offers the perfect blend of modern comfort and mountain

  Kathi Spencer Keller Williams Advantage Realty LLC

  

  342 Brook Cir, Boulder, CO 80302
• 

  

  /25

  $290,000

  • Land
  • 4.06 Acres
  • $71,429 per Acre

  6801 Sunshine Canyon Dr, Boulder, CO 80302

  Discover an unparalleled opportunity for development on this 4 acre lot in Sunshine Canyon. The groundwork for crafting a Colorado dream home is laid with architectural plans and stamped permits in place. Relish in the privacy and serenity of this sprawling property while admiring incredible mountain views. Septic, leach field and well are available for added convenience as well as close

  Paige Coutts milehimodern - Boulder

  6801 Sunshine Canyon Dr, Boulder, CO 80302
• 

  

  /33

  $249,000

  • Land
  • 1.85 Acres
  • $134,595 per Acre

  61 Rim Rd, Boulder, CO 80302

  This is a fantastic buildable lot close to both Gold Hill and Boulder. This southern facing gently sloping lot is ideal for a walk out home. It backs t to an unbuildable historical property with a miner's shed that has hundred of Aspen trees. Enjoy wonderful views and the beautiful indigenous pine trees on this property within a nicely developed subdivision. Use your imagination here and live the

  Andy Sepac LIV Sotheby's Intl Realty

  61 Rim Rd, Boulder, CO 80302
• 

  

  /5

  $1,075,000

  • Land
  • 2.18 Acres
  • $493,119 per Acre

  9634 Mountain Ridge Dr, Boulder, CO 80302

  Premier Mountain Ridge custom home building in the Boulder foothills. This amazing site has panoramic plains, Boulder city lights and mountain views. Extremely private lot offers a walkout building opportunity. Located just north of Lake of the Pines. You can bring your own builder or Masterwork Home Company can assist you with complete design and construction services.

  Brian Terry Bosch Real Estate Group, LLC

  9634 Mountain Ridge Dr, Boulder, CO 80302
• 

  

  /40

  $2,825,000

  • 4 Beds
  • 4.5 Baths
  • 5,138 Sq Ft

  5277 Westridge Dr, Boulder, CO 80301

  Nestled within the prestigious enclave of Waterstone, this exceptional single-family residence presents an unparalleled fusion of luxury and natural splendor. With its commanding position, this residence offers captivating vistas of the majestic Flatirons and the tranquil waters of Sixmile Reservoir, complemented by direct access to private trails and beach. Situated at the threshold of the

  Daphne Queen 8z Real Estate

  5277 Westridge Dr, Boulder, CO 80301
• 

  

  /40

  $5,000,000

  • 5 Beds
  • 6 Baths
  • 4,821 Sq Ft

  635 Paragon Dr, Boulder, CO 80303

  Overlooking the breathtaking Flatirons and Front Range, in the foothills of Boulder, Colorado, this exquisite luxury farmhouse offers an unparalleled blend of modern design and rustic elegance. Situated on 1.38 acres, the estate harmonizes contemporary architecture with natural beauty, creating a serene and sophisticated retreat. The home's striking exterior showcases exposed steel framing, a

  Jay Hebb The Agency - Boulder

  635 Paragon Dr, Boulder, CO 80303
• 

  

  /40

  $3,450,000

  • 4 Beds
  • 5 Baths
  • 4,742 Sq Ft

  512 Ponderosa Dr, Boulder, CO 80303

  Don't miss this custom architecturally designed, modern style property. Just about completely re-built from original home - down to the foundation. Fabulous panoramic mountain views throughout. Enter through a large glass & steel foyer w/a 2 story barrel ceiling. From there....step up to the living, dining, office kitchen areas. Cool electric fireplace, custom woodwork and high ceilings create

  Lisa Wade RE/MAX of Boulder, Inc

  512 Ponderosa Dr, Boulder, CO 80303
• 

  

  /31

  $649,000

  • 2 Beds
  • 1.5 Baths
  • 1,230 Sq Ft

  2663 Lloyd Cir Unit A3, Boulder, CO 80304

  Nestled in a quiet cul-de-sac adjacent to Parkside Park and one block from Elmer Two Mile Park, this charming 2-bedroom, 2-bathroom home is a rare, charming, and turnkey find in North Boulder! Imagine starting each day with a view of the foothills and enjoying a cup of coffee on your private front patio.This home is a cozy retreat while also being 5 minutes from downtown Pearl Street and walking

  Jessie Dunn The Agency - Boulder

  2663 Lloyd Cir Unit A3, Boulder, CO 80304
• 

  

  /29

  $10,000,000

  • 6 Beds
  • 8 Baths
  • 10,581 Sq Ft

  45 Bellevue Dr, Boulder, CO 80302

  One of Boulder's most iconic residences has arrived on the market for the very first time! Welcome to Belle Voir, a stunning, once in a lifetime offering set amidst the majestic scenery of the Flatirons and Chautauqua Park. Positioned on a generous two-acre property, this grand, custom-crafted estate enjoys an elevated setting with panoramic views of the surrounding protected open space,

  Jay Hebb The Agency - Boulder

  45 Bellevue Dr, Boulder, CO 80302
• 

  

  /14

  $375,000

  • Land
  • 4.53 Acres
  • $82,781 per Acre

  149 Millionaire Dr W, Boulder, CO 80302

  Escape to your own private paradise in the breathtaking Boulder, Colorado mountains. Owners have completed architectural plans for a lovely mountain modern residence AND an issued Boulder County conditional approval to build, saving you 1-2 years of planning. 149 Millionaire Drive West is a rare gem nestled amidst nature's grandeur, where serenity meets adventure. This captivating land property

  Michelle Steiner Compass - Boulder

  149 Millionaire Dr W, Boulder, CO 80302
• 

  

  /32

  $498,000

  • Land
  • 31 Acres
  • $16,211 per Acre

  300 Shining Star Trail, Boulder, CO 80302

  Top of the world. Tremendous opportunity for builders & those who want to build their own custom home on a remote, buildable lot with jaw dropping 360 VIEWS! Plans have been approved for a 3,780-square-foot luxury residence. Well and septic are already in place and in working order. Unbeatable view of snow capped peaks down to the twinkling lights of Boulder from this expansive lot spanning more

  The Bernardi Group Coldwell Banker Realty-Boulder

  300 Shining Star Trail, Boulder, CO 80302
• 

  

  /39

  $1,888,888

  • 4 Beds
  • 6 Baths
  • 4,096 Sq Ft

  37 Wagner Cir, Boulder, CO 80304

  Nestled in the heart of Boulder, where the Rocky Mountains rise in breathtaking splendor, lies 37 Wagner Circle—a home that perfectly blends luxury with the tranquility of nature. This stunningly remodeled residence, spanning an expansive 5,195 square feet, is more than just a place to live—it’s a retreat, a sanctuary, a masterpiece. As you approach, the gentle whispers of the surrounding

  Nicholas Quenzer Compass - Denver

  

  37 Wagner Cir, Boulder, CO 80304
• 

  

  /40

  $995,000

  • 3 Beds
  • 2 Baths
  • 2,377 Sq Ft

  291 Canon View Rd, Boulder, CO 80302

  Grandiose unobstructed views with a 300 degree panorama overlooking Boulder, Denver, and DIA, including the Flatirons and Indian Peaks to the West! The dynamic, all-encompassing view is showcased by floor to ceiling windows on the South side of the home & hot tub deck! BRAND NEW ROOF AS OF 4/9/2025! The unbeatable location is further enhanced by rare end of the road privacy and easy year round

  Judd Kaiman Revolutionary Realty, LLC

  291 Canon View Rd, Boulder, CO 80302
• 

  

  /37

  $3,400,000

  • 3 Beds
  • 2.5 Baths
  • 2,705 Sq Ft

  3500 Bison Dr, Boulder, CO 80302

  Nestled on 37.5 acres just 20 mins from downtown Boulder, this stunning sanctuary with incredible views is an award-winning custom completion by HMH Architecture. Originally a 1980s mountain cabin, the property has been meticulously transformed into a foothills oasis that seamlessly blends industrial materials with natural textures & peaceful solitude. The home's entry is a masterpiece of design,

  Zachary Zeldner Compass - Boulder

  3500 Bison Dr, Boulder, CO 80302
• 

  

  /19

  $259,900

  • Land
  • 1.85 Acres
  • $140,486 per Acre

  6319 Sunshine Canyon Dr, Boulder, CO 80302

  Nestled on a gently sloping mountainside, this remarkable parcel offers approximately two acres of pristine land with breathtaking panoramic views. Located a short drive from downtown Boulder, Colorado, this buildable lot combines affordability with the serenity of an idyllic retreat. Accessible via HWY 85 J through Sunshine Canyon, the site boasts epic, unobstructed panoramic vistas stretching

  Andy Sepac LIV Sotheby's Intl Realty

  6319 Sunshine Canyon Dr, Boulder, CO 80302
• 

  

  /16

  $299,000

  • Land
  • 15 Acres
  • $19,542 per Acre

  560 Wild Turkey Trail Unit 38, Boulder, CO 80302

  Great 15-acre building lot with double views and only 18 minutes to Boulder. Well, septic system, driveway and power are already in place. Wonderful opportunity to own a large parcel in in a private setting.

  Jimmy Keith RE/MAX of Boulder, Inc

  560 Wild Turkey Trail Unit 38, Boulder, CO 80302
• 

  

  /40

  $920,000

  • 3 Beds
  • 3 Baths
  • 1,911 Sq Ft

  20 S Boulder Cir, Boulder, CO 80303

  Three one bedroom units at The Seasons Condos, one of the units has NO steps and 32" bathroom doors, two units are are garden level one is on second floor (completely remodeled), all have one year old Stainless Steel Appliances. Stacked washer & dryer in each unit. Rents should be $1,675 to $1,875.The HOA fee are $239.79 each. See MLS # 1023539 for Unit 2102. Call Broker for more information.

  Bob Luna Cobalt Realty, Ltd.

  20 S Boulder Cir, Boulder, CO 80303
• 

  

  /19

  $310,000

  • 1 Bed
  • 1 Bath
  • 637 Sq Ft

  20 S Boulder Cir Unit 2102, Boulder, CO 80303

  Just painted inside, one bedroom, one year old carpet & Kitchen countertops, All Stainless Steel appliances refrigerator, range/oven, microwave, dishwasher, Newer stacked washer & dryer. Storage closet on patio. Community offers year around hot tub, pool, picnic areas with grills throughout the complex. Convenient access to Table Mesa/South Boulder Rd., Foothills Pkwy, RTD park & ride, HWY 36,

  Bob Luna Cobalt Realty, Ltd.

  20 S Boulder Cir Unit 2102, Boulder, CO 80303
• 

  

  /34

  $430,000

  • 2 Beds
  • 2 Baths
  • 965 Sq Ft

  7452 Singing Hills Dr Unit H7452, Boulder, CO 80301

  Back on market due to buyer's financing falling through. Welcome to 7452 Singing Hills Drive, a well-cared-for Gunbarrel Green condo with newly updated bathrooms and brand new furnace with a rare attached garage ensuring you will never have to carry groceries in the winter cold again. Backing to a wide open greenbelt and open space with the LOBO and White Rocks hiking and biking trails just

  Stewart Ward Compass - Boulder

  7452 Singing Hills Dr Unit H7452, Boulder, CO 80301
• 

  

  /11

  $1,150,000

  • Land
  • 37 Acres
  • $31,081 per Acre

  11320 Gold Hill Rd, Boulder, CO 80302

  There is nothing like this available in Boulder County ~ Site Plan Approval in place ~ ready to build! Architectural plans available! Or design your own beautiful new home. INCREDIBLY PRIVATE * Level building site with amazing views of the snowy peaks of the Rocky Mountains! A real prize to build your dream home in a location that's so convenient to everything! 20 minutes to Ski Eldora and 30

  Candace Loving Gateway Real Estate Vail Valley

  11320 Gold Hill Rd, Boulder, CO 80302
• 

  

  /41

  $1,925,000

  • 3 Beds
  • 3.5 Baths
  • 3,951 Sq Ft

  6057 Red Hill Rd, Boulder, CO 80302

  Come for the peaceful retreat, stay for the view! This dream home is truly a must see to fully appreciate. The views are non-stop in this uniquely laid out mountain-scape that offers 180-degree views . Additionally it boasts a new deck, new roof, fenced-in yard, luxury primary suite and heated garage. Not to mention all the easy access to outdoor activities including hiking your own property to

  Jennifer Davis eXp Realty, LLC

  

  6057 Red Hill Rd, Boulder, CO 80302
• 

  

  /50

  $3,515,000

  • 4 Beds
  • 3.5 Baths
  • 4,333 Sq Ft

  987 Lost Angel Rd, Boulder, CO 80302

  This extraordinary estate offers the opportunity to own a modern mountain home that redefines mountain living. Just 15 minutes outside of Boulder, this 24-acre property seamlessly blends natural beauty, architectural excellence, and privacy in an esteemed setting that melds understated luxury with the rugged backdrop of this great Colorado wilderness. The property was rebuilt in 2018 by a retired

  David Hakimi Berkshire Hathaway HomeServices Colorado Real Estate, LLC – Erie

  

  987 Lost Angel Rd, Boulder, CO 80302

Showing Results 81 - 120, Page 3 of 4