Three Squared, Inc.

The firm specializes in:

• Modular and prefabricated building design
• Steel-framed and high-performance construction systems
• Multifamily housing and mixed-use developments
• Commercial and community projects (e.g., markets, performance and community spaces)
• Innovative single-family homes and infill housing prototypes

Three Squared works with:

• Real estate developers
• City and public agencies
• Modular and prefabrication fabricators
• Other partners involved in delivering residential and commercial projects

The team emphasizes designs that:

• Reduce construction timelines
• Improve constructability and permitting outcomes
• Balance upfront costs with long-term operating and maintenance savings
• Deliver durable, code-compliant buildings that perform over time.

• Evaluate the proposed site and its context.
• Identify potential risks, challenges, and constraints early.
• Help confirm that the land is viable before acquisition or major financial commitments.

Stage 2 – Pre-Design and Approvals

• Align project vision, priorities, and goals with the client.
• Review and validate applicable codes and zoning requirements.
• Establish the overall design direction.
• Test the concept against high-level budget targets.
• Set up the project for a smooth path into detailed design and approvals.

Stage 3 – Design Development

• Develop the approved concept into a fully buildable design.
• Coordinate with engineering and key technical consultants.
• Align pricing with a contractor or builder where applicable.
• Prepare permit-ready drawings and documentation.

Stage 4 – Build and Closeout

• Support construction with ongoing oversight and coordination.
• Help guide the project from construction through final walkthrough.
• Assist with a smooth handoff from completion to occupancy or move-in.

Main office

• Address: 2541 Trumbull, Detroit, MI 48216, USA
• Visits: The office is visit by appointment only.

If you would like to speak with the team, discuss a potential project, or request more information, you can:

• Call or email using the details above, or
• Use the contact form on the Three Squared, Inc. website to share project information and request a follow-up.

For project-specific questions (scope, feasibility, budget alignment, or schedule), the team typically recommends an initial conversation to understand your goals and determine the best next steps in their service process.

Lists Trumbull and Detroit as a location. Names Trumbull and Detroit as a service area. Areas beyond these are not published.

• Leslie Horn – Co-Founder, CEO

Founder and CEO with a strong background in real estate development, marketing, public speaking, and nonprofit leadership. Leslie has been instrumental in advancing innovative, code-compliant modular and prefabricated projects and in building partnerships with city planners, financial partners, and industry experts.

Design and project delivery team (selected roles)

• Director of Design / Lead Architect – Leads architectural design direction and technical delivery of projects.
• Architectural Designers and BIM Manager(s) – Support design, documentation, and coordination, including building information modeling.
• Director of Projects – Oversees project management and delivery across the portfolio.
• Development Associates – Support feasibility, development coordination, and stakeholder engagement.
• Marketing and Communications – Manage outreach, brand, and communications.

Three Squared also collaborates with a wider network of engineering, construction, modular fabrication, and specialty partners as needed to deliver multifamily, commercial, and single-family projects.

Ask anyway — the agent will say plainly that it is not published rather than guess.