Rather than catering to wealthy clients, Wilburn marketed her residential designs to the middle class through a series of plan books. This was a propitious choice as Atlanta's suburbs were expanding and there was a need for new apartment buildings in the city. Thanks to her location in the Peters Building, she developed close ties with contractors, builders, and developers, who bought her plan books and her plans and built her houses by the hundreds. Her plan books allowed middle class buyers to benefit from her expertise without having to pay the fees of a professional architect.