PropertyShark.com, a real estate data site, has developed a tool that allows real estate professionals and others to quickly develop lists of property owners and contact information based on user-specified criteria. The ListBuilder tool also allows users to create mailing labels based on the customized lists. PropertyShark promotes the tool as potentially useful for residential Realtors, interior designers, real estate developers, investors, lenders and commercial brokers, as these professionals could use ListBuilder to search for prospective clients and new business opportunities. Lists can be customized based on location, including borough, community district, neighborhood, ZIP code, block, or owners within a specific building. Lists can also be customized by class of building, ...