Black Retail wanted an inviting space for clients and employees when it opened its new office last summer. The Minneapolis-based branding agency (incorporated as Black Design Inc.) provides retail companies with services ranging from advertising and marketing to store design. The office, in the former warehouse building at 219 Second St., has a black and white color scheme to reflect Black Retail's brand with orange accents to add a pop of color. The office's most unique feature is the square...