In this section, the following words have the meanings indicated. “Building” has the meaning stated in City Code Article 13, § 11-1 {“Definitions”}. “Property owner” means the person who holds the title to a vacant structure. “Vacant lot” means:an unimproved parcel of real property; or an unimproved portion of a block that is identified by a symbol in accordance with <cite data-doc="City of Baltimore, Md., Charter" data-path="VII|§116|(k)">City Charter Article VII, § 116(k)</cite> {“System of Uniform Property Identification”} and shown on a block plat filed with the Department of Transportation. “Vacant structure” means a structure or distinguishable part of a structure that is:unoccupied; and unsafe or unfit for human habitation or other authorized use.