Use of Existing Undeveloped Properties. Undeveloped properties may be developed with uses requiring a minimum investment in permanent improvements, such as outdoor storage operations that are aesthetically compatible with other permitted land uses in the STA. As the city would consider such operations interim uses of land, unless deemed necessary for public health and safety or for the protection of the public or adjacent properties, the city may choose to waive or defer requirements for permanent improvements, such as curbs and sidewalk and the undergrounding of overhead utility lines. However, appropriate screening of storage, paving where appropriate, and landscaping will be required. This subsection (F)(5) shall not apply to those properties that have become vacant as a result of the relocation of a business or other land use with the assistance of the Lemon Grove development services department.