Onion Flats is a leading architecture and property management firm dedicated to sustainable design and innovative construction practices. With a focus on multifamily and specialty housing, including affordable and high-performance buildings, we aim to enhance community impact through thoughtful design. Our team of seasoned professionals brings decades of experience in architecture, construction, and development, ensuring that each project meets the highest standards of energy efficiency and sustainability. We offer a comprehensive range of services, including architectural design, sustainability consulting, and project management, all grounded in our commitment to net-zero construction. Our recent projects showcase our expertise in deep energy retrofits and LEED certification, setting new benchmarks for urban living. Based in Philadelphia, with additional operations in Boston and Manchester, we are dedicated to creating resilient, low-impact buildings that serve the needs of diverse communities.