About Us

Our Mission

Manatus Development Partners, led by Justin Stern, is committed to transforming communities through strategic, mission-driven development. We specialize in projects that create long-term social and economic value across New York City’s five boroughs, with a focus on critical community infrastructure such as schools, healthcare centers and administrative offices for not-for-profits.

Through adaptive reuse and ground-up development, we embrace a sustainable, thoughtful, and impact-driven approach that fosters inclusion, resilience, and long-term neighborhood growth. At Manatus, we believe real estate is more than just physical structures—it is a catalyst for social change and economic empowerment.

We actively work with like-minded organizations, institutional investors, and public-private partners who share our vision for equitable, community-focused development. Whether you are a nonprofit seeking expansion, a public entity with an urgent infrastructure need, or an investor looking to make a measurable impact, we welcome the opportunity to co-create transformative projects that leave a lasting legacy.

Let’s build stronger communities together—one impactful project at a time.

Meet Our Team

Justin Stern

Gary Spindler

Founder, Managing Member

Partner

Sr. Vice President of Construction

Project Manager, Construction

Associate, Acquisitions and Development

Project Manager, Construction

Josette Bien

Mark Skowronski

Gary Spindler

Alexander Sanchez, P.E.

Steven Dobbs

Tim Weigley

Matt Greely

Project Manager, Construction

Project Accounting Associate

Mission-Driven Development. Impact-Focused Investing