The business community of downtown Overland Park is welcoming the arrival of several creative and service-oriented entrepreneurs, including some that have renovated existing buildings. Meet Downtown Overland Park’s New Arrivals Technology staffing company nexus IT group has moved its office to 7512 80th St., where it has refurbished the former Arnold’s Lawn and Garden storage facility. Architectural design firm Momenta has moved its office to 8024 Conser and renovated the…