(262) 932-4188 N63 W23849 Main Street Sussex, WI 53089

Our Communities.

Cornerstone Development, headquartered in Sussex, WI, is the preeminent developer and builder of ranch-style Wisconsin condominium communities. Cornerstone’s The Glen at Seven Stones in Sussex, captured the 2015 MBA Achievement Award for Best Development of the Year!

Discover our Communities

Our Models

Our Wisconsin condominium developers offer ranch-style condo floor plans varying in designs, construction features, and lifestyle.

Our innovative communities are designed to appeal to retirees, rising young executives and single-again buyers. Visit or call us to learn more about unique, comfortable, hassle-free living!

Browse our Models

Schedule a Tour

Our main office is located at:
Cornerstone Developments of S.E. WI, LLC
N63 W23849 Main Street
Sussex, WI 53089

Schedule a tour of any community.  Click  “Visit Us”  and call the phone number of the community you would like to see. We look forward to meeting you!

Visit Us

Welcome to Cornerstone’s Completed Neighborhoods!!

Great New Lifestyles Now Being Enjoyed Every Day!

Cornerstone Development is helping people build new lifestyles each and every day!  The “proof in the pudding” rests in how quickly our neighborhoods have been selling out.

Take a brief photo tour and see for yourself!

View Our Sold Out Communities

Get to know The Glen at Cedar Creek

Cornerstone Development of SE Wisconsin proudly invites you to tour our newest community, The Glen at Cedar Creek in historic Cedarburg.

Single-Family homes located in a beautiful country setting.. just minutes from all of the conveniences you desire!

Featured Model: The Aberdeen

Bedrooms: 2  Baths: 2  Laundry: Main level  Sq. ft.: 1,667

  • All
  • The Glen at Cedar Creek
  • The Glen of Greenfield
  • The Glen of Mukwonago
  • The Villas at Maplewood Terrace
  • The Woodlands at Greenfield
The Villas at Maplewood Terrace
The Villas at Maplewood Terrace

What our homeowners say about us.

  • Everyone we worked with was friendly, knowledgeable and professional. Well done!

    – Ann Marie Way Oconomowoc, WI

  • They did a terrific job and the quality of the workmanship was awesome. A friend found the community for me. I wanted a ranch condo and it was the right size. It fit my needs.

    – Black Bear Drive Mukwonago, WI

  • Location, location, location! Exterior design, Amenities, Price, Density. Most town-homes and communities we looked at were near water towers, highways and busy streets or high-power lines.

    – Ann Marie Way Oconomowoc, WI

  • I found out about the community from friends that live in the subdivision right next door. We also kind of knew about it from the newspaper and used to live in the area. The location most significantly influenced our decision to purchase in the community.

    – William Drive Sussex, WI

  • We are happy with the home overall. We personally know John. We chose Cornerstone because of our friendship with John.

    – Ann Marie Way Oconomowoc, WI

Our company news

Keep up with the happenings at Cornerstone Development!

  • The Glen at Seven Stones Honored as ‘Best Development’ Sussex, WI – Cornerstone Development of SE Wisconsin LLC is excited and proud to announce that The Glen at Seven Ston

    Author ImagePkman53
    06 June, 2015

  • Apparently, Wisconsin is the place to go for an active, enjoyable life after age 50. At least, that’s what a new livability index from AARP says. Apparently, Wisconsin is t

    Author ImagePkman53
    17 July, 2015

  • Cornerstone Development Succeeds Offering Appealing Lifestyle Options One suburban condominium developer continues to enjoy remarkable success with ranch-style condominium

    Author ImagePkman53
    25 July, 2015

Learn more. Schedule a tour!