American Christmas in Mount Vernon celebrated the opening of its first retail outlet Monday at its 30 Warren Place headquarters. The 1,000-square-foot Christmas in America boutique is stocked with the essentials to reproduce an attention-grabbing American Christmas display, from props to ornaments and lights. The BCW member creates holiday displays for some of New York City’s most iconic attractions, ranging from the heralding angels at Rockefeller Center to the 13-foot-tall nutcrackers posted outside the UBS building on 6th Avenue in Manhattan. Every holiday season, the company installs more than 525 holiday displays nationwide and internationally.