Except as provided in this article or elsewhere in this chapter, all other standards, minimum requirements, prohibitions and special exceptions as are set forth in Article V, R-18 Residence District, shall apply to all uses and structures in the R-12 Residence District, except that houses of worship shall have a lot area of not less than 2.5 acres and a lot frontage of not less than 100 feet, and off-street parking facilities shall be provided which are set back not less than 40 feet from the front line of the property, and the parking area shall be completely screened from the front lot line by a screen of evergreen trees not less than six feet in height when planted.