No building or structure shall hereafter be erected and no existing building or structure shall be altered or enlarged, nor shall any land, building or structure be used, for any purpose other than one which is included among the uses listed in Article V as permitted in the district in which such building, structure or land is located, nor in any manner contrary to any of the requirements specified in Article V.

No building or structure shall hereafter be erected, reconstructed or altered to exceed the maximum FAR or the height limit designated in the Schedule of Regulations contained in Article V for the district in which such building is located.

No building or structure shall hereafter be erected, nor shall any existing building or structure be altered, nor shall any open space contiguous to any building be encroached upon or reduced in any manner, except in conformity with the yard, plot width and area, percentage of plot coverage by building area, off-street parking space, off-street loading space and other space and area regulations designated in Articles V and VIII and in said schedule for the district in which such building or space is located and designated on the Setback Map which is a part of this chapter,[1] provided that the minimum plot width and plot area regulations shall not apply to any plot having less than the required width or area at the time of the adoption of this chapter or of any amendment thereof increasing the width or area required for such plot and held at that time and continuously thereafter in separate ownership from that of adjoining land, but such plot shall not be reduced in width or area and all other regulations prescribed in this chapter for the district in which such plot is situated shall apply thereto.

Off-street parking space and off-street loading space shall be provided as specified in Articles V through X, and such spaces shall be provided with necessary passageways and driveways appurtenant thereto and giving access thereto, and all such space, together with such passageways and driveways, shall be deemed to be required space on the plot on which the same is situated and shall not thereafter be encroached upon or reduced in any manner except as otherwise provided in § 200-61.

No plot area shall be reduced or diminished so that the FAR prescribed in this chapter shall be exceeded or the minimum land area per dwelling unit, yards or other open spaces thereon shall be smaller than as prescribed by this chapter.

In computing the plot area to determine the FAR in the C-R District, no private street or roadway which gives access to the plot or over which other property owners in the general area have rights-of-way shall be included in the plot area.

No yard or other open space provided on one plot for the purpose of complying with the provisions of this chapter shall be considered as providing a yard or open space required on any other plot.

Nothing contained in this chapter shall require any change in the plans, construction or designated use of a building or structure, a substantial portion of which was lawfully constructed at the date this chapter or any amendment thereof affecting the same takes effect and which construction is completed within one year after such date.