Helianthus LLC Architectural Design & Building Visit Website Request Info 1836 W Fond Du Lac Ave Ste 100 Milwaukee, WI 53205 (414) 622-0103 Facebook About Map About Helianthus LLC designs environmentally sustainable landscapes that are good for the planet, and attractive to people. We specialize in native landscape design and green infrastructure. What's Nearby? Distance: 5 10 15 20 25 50 mi.