The requirements of this chapter, as amended from time to time, shall apply to all development or changes in land use within the municipal borders of the City of Nashua, including those undertaken by the City of Nashua and its constituent and affiliated agencies, departments and officials, to the fullest extent of the law, except when the City of Nashua acquires an interest in land for a highway as defined in RSA 229:1. If, as a result of the City acquiring said interest, there is a violation of this chapter on the private property remaining after partial acquisition, then that violation is deemed nonconforming and shall be governed by Article XII, Nonconformities.