Office Space for Lease – Class A Medical/Professional Office Building on Avenue U. Take advantage of this brand-new Class A office space, available for immediate lease on the second floor of a newly constructed professional building. Located in a busy residential and commercial area of Brooklyn on Avenue U, this space is fully equipped for medical use. The 3rd Floor, consisting of approximately 3,000 SF is currently vacant. It was previously being used by an Orthopedic Surgeon Practice.