Who We Are

Weller Development Company is an innovative full-service real estate development firm that offers a wide range of expertise and a multi-disciplinary approach to building extraordinary communities. Its principles are Founding Partner Marc Weller, Partner Steve Siegel and CFO/COO Mike Gaffney, who are established real estate executives with more than 100 years of combined experience. Weller Development Company has a growing portfolio of distinct mixed-use projects, and a proven track record of successful and celebrated developments across the Mid-Atlantic region. The team delivers value and results, no matter the complexity or odds.

As a comprehensive development firm, Weller Development Company is distinguished by a holistic approach with a focus on community and economic impact. The team is comprised of passionate leaders with expertise in all phases of development including master planning, development, construction management, finance, asset management, community engagement, legal affairs, marketing, and property management.

What We Do

Weller Development partners with visionary investors to create large and small-scale development projects with the potential to transform cities. We use a double bottom-line approach, creating strategies that are financially viable, while also providing positive social impact to surrounding communities.

Weller Development Company is lead developer of Port Covington, one of the largest urban revitalization efforts in the United States. The 235-acre development area is located on Baltimore City’s prime waterfront. With 1.1 million square feet currently under construction, Port Covington is already bringing fundamental and far-reaching impact on Baltimore’s future. At completion, this transformative project will include: up to 14 million square feet of new, mixed-use development; 2.5 miles of restored waterfront; and 40 acres of parks and green space. The Port Covington redevelopment is generating opportunities for investment, innovation and entrepreneurship for Baltimore City residents and its local workforce.

Weller Development Company leverages its dynamic experience to bring vibrancy to new and existing neighborhoods by designing spaces where people gather, innovate, and create. The team brings its developments to life by activating communities with unique events and creating meaningful experiences for diverse audiences. The company has expertise in elevating brands, shaping narratives, and exceeding expectations. Weller Development Company has a sterling track record of delivering profit to investors while providing communities with exceptional spaces as a result of our unique approach to real estate development.


Weller Development Company is excited to introduce a new podcast, From the Ground Up with Marc Weller. The team at Weller Development Company believes in the idea that “a rising tide lifts all boats.” And on land, cranes have that same potential, to lift and transform cities, from the ground up. With over 40 years of joint experience developing and building residential, commercial, and mixed-use real estate projects, real estate pros Marc Weller and Matt Rienzo offer a unique and powerful range of expertise for all phases of development. Put on your hard hats as Marc and Matt lead lively discussions on development trends and projects with guests from across the industry. Plus, listen in for a special segment called the #RisingTideMoment to hear real-world real estate examples that are truly lifting the industry and communities.

Awards and Mentions

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