US commercial real estate listings from Showcase for a city, for lease or for sale: listing ID, title, property type (office, retail, industrial, flex, coworking...), asking rent or price text as shown (e.g. $19.00-$21.00 USD/SF/yr, or rent withheld), address, size range in square feet and number of spaces, and listing URL; 30 per page plus the number of matching listings (Showcase caps it at 500). Optional property-type filter on the page.