We steward exceptional places.

Derne Street Capital is a boutique real estate investment and development firm focused on thoughtfully restoring, repositioning, and operating distinctive buildings throughout New England.

We believe buildings are more than investments. They shape the daily lives of the people who work, live, and gather within them. Our role is not simply to own real estate, but to steward places that become more useful, more welcoming, and more enduring over time.

Founded on lifelong friendships, family values, and generations of real estate experience, Derne Street Capital takes a long-term view of ownership. We combine disciplined investment with thoughtful design, hands-on management, and a deep respect for the history and character of every building we acquire.

Whether restoring a historic landmark or reimagining an overlooked property, we begin with the same question: How can we build for the next generation?

Our Team

  • Lou Tamposi

    Lou Tamposi is a Principal and Co-Founder of Derne Street Capital, where he leads the firm's investment strategy, acquisitions, and development activities. Before co-founding Derne Street Capital, Lou helped deliver more than $1.5 billion of multifamily development across Massachusetts, Connecticut, and New York as part of Toll Brothers Apartment Living. Earlier in his career, he worked in commercial real estate brokerage at Avison Young and taught middle school English through Teach For America.

    Lou earned a B.A. in English from Tufts University and completed the Business Bridge Program at the Tuck School of Business at Dartmouth. He lives in Dover, Massachusetts, with his wife, children, and dog, and enjoys cooking, writing, bowhunting, spearfishing, and exploring the outdoors with his family.

  • Tyler Griffin

    Tyler Griffin is a Principal and Co-Founder of Derne Street Capital, where he leads the firm's development and project execution. Before co-founding the firm, he managed more than $680 million of ground-up development projects nationwide as part of The RMR Group's national development team. Earlier in his career, he worked at Boston Realty Advisors and completed CMB's Construction Training Program.

    Tyler earned a B.S. from Trinity College, completed the Business Bridge Program at the Tuck School of Business at Dartmouth, and holds a master's degree from Fordham University. He lives in Bronxville, New York, with his family, serves on the Board of Camp Belknap, and enjoys skiing, hiking, and summers at Lake Winnipesaukee.

  • Justin Griffin

    Justin Griffin is a Principal and Co-Founder of Derne Street Capital, where he leads the firm's branding, leasing, communications, and strategic partnerships. Before entering commercial real estate, Justin advised Fortune 500 companies, nonprofit organizations, and public officials on communications, strategy, and public affairs, including Google, Bayer, Caterpillar, the U.S. Chamber of Commerce, and Governor Charlie Baker's reelection campaign.

    Justin earned a B.S. from Clark University and an MBA from the NYU Stern School of Business. He founded Bipartisan Cause for a Cure in support of the Michael J. Fox Foundation for Parkinson's Research and serves on the Board of the Community Fund of Bronxville, Eastchester, and Tuckahoe. He lives in Bronxville, New York, with his wife, son, and their two dogs.