Two-family detached dwellings, which shall have a roof other than one of the character or description known as the "flat roof," subject to the prior approval of the Board of Appeals, which may, in specific cases, after public notice and hearing, and subject to appropriate conditions and safeguards, determine and vary the application of the provisions herein established, in harmony with the purposes enumerated in the Village Law of the State of New York and the general purpose and intent of this chapter, by granting permission to erect or alter a building for use as a two-family detached house in the Residence B District, when said Board finds as a fact:
(1) A two-family dwelling will not tend to depreciate the value of existing dwellings in the neighborhood.
(2) A two-family dwelling will not conflict with the type and character of existing dwellings or of dwellings under construction or reconstruction in a neighborhood.
(3) A two-family dwelling is not prohibited by covenant or restriction contained in a deed or other instrument affecting the premises.
(4) The applicant has consented, as a condition for the issuance of a permit to construct a new dwelling or to alter an existing building, to construct the same in accordance with plans and specifications to be approved by both the Board of Appeals and the Board of Architectural Review so that it will harmonize with the neighboring dwellings both as to appearance and utility.
(5) Such construction, alterations and improvements, among other things, will provide suitable safeguards against fire hazards and provide for the construction of but one front entrance to the building.
(6) The applicant has consented to comply with and abide by all requirements of the municipal departments having jurisdiction.
(7) A minimum of four off-street spaces shall be provided.
(8) The Board shall take into consideration the lot sizes and parking requirements of existing properties within 500 feet of the lot on which permission is sought to construct a two-family house.