About Us

MainStreet 407 Homes Companies are builders of single family homes and townhomes in the Mid-Atlantic region encompassing Washington, D.C., Delaware, New Jersey, Pennsylvania, and Virginia.

The company is part of the 407 Associates, LLC family of companies which through four other subsidiaries, home improvement and restoration, custom home building, and design and engineering services. The family of 407 Associates, LLC companies allows for the sharing of design and construction professionals for projects that require a range of services, and offers greater material and subcontractor buying power, with cost savings passed on to its customers.

Each MainSteeet407 Homes Companies’ project manager and onsite superintendent has over 20 years of experience in the field that he or she brings into every customer home-building project. Our project managers and onsite superintendents interact closely with the professionals in our affiliated MainStreet companies for their expertise in architecture, interior design and engineering as well as with those professionals that have with Masters licenses in Electrical/Plumbing and HVAC.

Jeff Kozero, PE
Founder and CEO

Jeff graduated from the Pennsylvania State University with an engineering degree and is a licensed Professional Engineer. Over the course of his career, Jeff  has started and grown an architectural/engineering firm from a local DMV presence to a National Footprint. In addition, Jeff has started and managed various real estate development companies that have provided development, design and construction related services. These projects resulted in over 12 million constructed square feet and valued at over $2.9Billion. Jeff has now created 407 Associates to become a complete design/development/management company.

Karl Griffin
Director of Design

Karl A. Griffin has over 10 years of experience in the architecture and design industry. With a passion for creativity and a strong eye for detail, Karl has successfully led numerous design projects, ranging from residential to commercial buildings, with a focus on innovation, sustainability, and functionality. He holds a Bachelor of Architecture degree from The University of the District of Columbia and has continued to expand his knowledge and skills through various professional development programs and workshops. He is a member of several professional organizations, including AIA, NCARB and NOMA. Karl is dedicated to helping the company achieve its vision of becoming the leading provider of innovative and sustainable design solutions.

Dan Morrison

Director of Construction Services

Dan Morrison has been working in the construction industry in the DC, MD, PA, VA (DMV) area since graduating from high school. In 2000, Dan started a very successful Home Building company, serving the DMV area. During the global economic meltdown in 2008, Dan changed course and started successful Home Inspection and Construction Management companies. In 2019, Dan started a successful Underground Utility Installation company working with clients such as the National Institutes of Health, BGE, and many developers. In 2022, Dan brought his company to 407 Associates, taking advantage of the synergies provided by the 407 development, design, and construction companies.

Brenda Duckett

Brenda Duckett has vast experience in the Finance and Managerial Sector. Brenda started her career as a Mortgage Customer Service personnel with Equifax, rising quickly to supervisor within 6 months of her assumption of duty and exiting the company as VP of Operations. She was the CEO of two startup companies, serving contractors and small businesses with office administration, accounting service, and permit processing.  Brenda has been a manager for the past 33 years, outlining her success as the Director of Finance and overseeing the Administrative offices for 407 Associates, LLC. She can be described as the engine room of our organization.