Featured Project 79 Madison Ave. Colliers partners with Henricksen and Allsteel on spec suite at 79 Madison Avenue in New York City Henricksen is a trusted partner with building owners and developers in creating innovative spec suite programs. Our partnerships with building owners and developers have given rise to unique interiors that inspire prospective tenants. Versatile and flexible workspaces together with hospitality-inspired amenities areas attract new tenants, differentiate properties, and maximize return. As a contract furniture dealer experienced with spec suites, Henricksen will help you make informed decisions to achieve your goals.