Futuristic $21 Million Concrete Beach Fortress Designed To Withstand the Elements Becomes the Week’s Most Popular Home

An oceanfront, concrete fortress designed to withstand the elements in Del Mar, CA, is the week’s most popular home on Realtor.com®.

Built in 2016, the four-bedroom residence is listed for an eye-popping $20.95 million and offers 50 feet of direct Pacific Ocean frontage. With just 2,000 square feet of interior space, the jaw-dropping listing price of $10,475 per square foot garnered thousands of clicks this week.

Luxurious highlights include a two-story living room with a floor-to-ceiling fireplace, a primary suite surrounded by glass, and an outdoor terrace with a modern gas fireplace.

With “no boundaries” separating the indoor and outdoor spaces other than disappearing glass walls, the stunning home “lives like it is much larger than it actually is,” according to the listing.

Also grabbing attention this week are a luxurious French Provincial estate with a guesthouse listed for under $1 million in Louisiana; a “gut-renovated” Hamptons mansion; and an inexpensive, three-bedroom residence built into a hillside in Wisconsin.

10. 16978 W Third Ave, Wasilla, AK

Price: $165,000

Why it’s here: It’s an inexpensive Alaskan log cabin in Point MacKenzie that would be ideal for use as a private retreat or rental property.

Built in 2004, the tiny studio home offers just 456 square feet and one bedroom in the loft area. There is a cute galley kitchen, a cozy wood-burning stove in the living room, and a full bathroom with a jetted tub.

Designed for the outdoor enthusiast, the wood-frame home is surrounded by wildlife and close to trails.

9. 5142 30th Ave Apt 5P, Woodside, NY

Price: $330,000

Why it’s here: It’s an affordable, recently renovated, co-op apartment just 20 minutes from Midtown Manhattan.

Offering 700 square feet of space, the one-bedroom modernized unit has an updated kitchen with granite countertops and stainless steel appliances. Restored hardwood and new tile floors are found throughout the space.

The 11-acre property, conveniently located near the trains and bus, also features community amenities, including bike storage and multiple laundry rooms.

8. 1043 Parkpoint Dr, Slidell, LA 

Price: $900,000

Why it’s here: This French Provincial estate with a guesthouse is listed for under $1 million and features many lavish amenities.

The 4,000-square-foot residence boasts four en suite bedrooms, a floating staircase, and a two-story living room surrounded by windows. Other highlights include a primary suite with a mural and a curved wall, and a loft with a pool table.

The 2-acre property also has a three-car garage, two covered patios, a saltwater pool, and lots of green open space.

7. 643 Island Park Dr, Charleston, SC

Price: $4,100,000

Why it’s here: It’s a luxurious Daniel Island estate with five fireplaces abutting Beresford Creek Golf Course.

Built in 2005, the five-bedroom residence is fresh off of a 2024 renovation by Caliber Construction. The 6,385-square-foot interior features three stories of ornate space, including a glass climate-controlled wine cellar, a home theater, a wood-paneled office, a third-floor entertainment area, and a sunroom.

Located near Daniel Island Club, the private property also has access to tennis and pickleball courts, an athletic facility, and resort-style pools.

6. 190 Upper Pines Rd, Warren, VT

Price: $1,975,000

Why it’s here: It’s a stunning luxury lodge offered fully furnished on 7.6 acres of privacy, just minutes from Sugarbush Resort.

Built in 2001, the 3,600-square-foot interior was transformed by architect David Sellers from an original 1968 home into a stunning design. Interior highlights include a three-story atrium, exposed maple tree trunks in the main hall, a four-person steam room, and an entirely renovated wraparound deck.

“Ongoing improvements” include a three-car carriage barn and a sports equipment shed.

5. 47 Herne Pl, Southampton, NY

Price: $2,865,000

Why it’s here: It’s a “gut-renovated” Hamptons mansion on the East End in an oceanfront community.

The four-bedroom contemporary now boasts luxury finishes, including white-oak floors and Venetian plaster walls. The 2,400-square-foot, modernized interior also features an open-concept kitchen, a library, a wet bar with a wine fridge, and a lower-level fitness center.

Meanwhile, a deck overlooks the in-ground pool.

4. 3486 Whytecliff Way, Burke, WI 

Price: $189,900

Why it’s here: Attention, investors: Here’s an inexpensive, three-bedroom residence built into a hillside looking to be finished off, 10 miles northeast of Madison, WI.

Offered as is due to the need for mold remediation, the 2,100-square-foot, nearly underground interior with “gorgeous tiling” also has stone details and arched doorways. There is also a fireplace and floor-to-ceiling windows to let in some natural light.

Potential buyers should note that “any items left in the property” will stay, and the property is being shown “at your own risk.”

3. 13900 SE 89th St, Oklahoma City, OK 

Price: $485,000

Why it’s here: It’s a uniquely designed, one-bedroom home nestled above a four-car garage.

The 2,400-square-foot residence has a chef’s kitchen with quartz countertops; a wood-paneled living room; a double-sided, wood-burning fireplace; and a “hidden” primary suite. Designed with energy efficiency in mind, the nearly 3-acre property has a 160-foot well, a whole-house generator, a tankless water heater, and a storm shelter in the garage.

A back porch offers views of the private pond.

2. 1205 Perez St Unit 1, Austin, TX

Price: $649,000

Why it’s here: It’s the unique opportunity to own two recently completed residences for the price of one!

Dubbed the Perez Tree House, the 1,301-square-foot modern interior features a primary residence with two bedrooms and a detached apartment that could be used as a guest suite or for rental income. The sleek interior also offers a primary bedroom with glass sliders that open up to a private terrace.

A covered deck connects the two properties and offers an ideal spot for outdoor entertaining.

1. 2112 Ocean Front, Del Mar, CA

Price: $20,950,000

Why it’s here: It’s a concrete residence offered for an astronomical $10,475-per-square-foot asking price.

The 2,000-square-foot interior has mile-high ceilings and disappearing glass walls that offer a seamless transition to the outdoor space. Adding to its contemporary design are solid teak wood accents, vaulted ceilings, and skylights.

Outside, there is a barbecue area, foot wash station, shower, and surfboard storage space.