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Sec. 4. Medium-density residential district (MDR). Statement of purpose. The purpose of the medium-density residential district is to provide areas within the city for the development of good quality multifamily housing at densities up to eight units per acre, and good quality single-family housing, at densities of up to two units per acre, including mobile homes where appropriate, while protecting established neighborhoods from undesirable impacts from these uses. Applicability. The standards of the medium-density residential district shall apply to all land shown on the "Official Zoning Map of the City of Lewiston" as being located within a medium-density residential district. Permitted uses. In a medium-density residential district, any new building or structure which is constructed, any existing building or structure or part thereof which is used, altered or enlarged and any parcel of land, whether in whole or in part, may be used for one or more of the following: Single-family detached dwellings and mobile homes on individual residential lots; Multifamily dwellings in accordance with the standards of article XIII; Single-family attached dwellings in accordance with the standards of article XIII; Two-family dwellings; Mixed single-family residential developments in accordance with the standards of article XIII; Mixed residential developments in accordance with the standards of article XIII; Neighborhood stores as part of a multifamily development, mixed single-family residential development or mixed residential development provided that the gross floor area devoted to retail use shall not exceed ten percent of the total floor area of the development; Boarding houses; Group care facilities; (10) In-law apartments in single-family detached dwellings in accordance with the standards of article XII; (11) Religious facilities including churches, synagogues and other houses of worship, rectories and parsonages and church-affiliated community purpose facilities; (12) Forest management and timber harvest activities in accordance with the standards of article XII; (13) Cemeteries; (14) Family day care homes; (15) Home occupations; (16) Accessory buildings, structures and uses; (17) Single-family cluster developments; ---PAGE BREAK--- (18) Small day care facilities accessory to public schools, religious facilities, multifamily or mixed residential developments and mobile home parks. Conditional uses. In a medium-density residential district, any new building or structure which is constructed, any existing building or structure or part thereof which is used, altered or enlarged and any parcel of land, whether in whole or in part, may be used for one or more of the following uses only after the issuance of a conditional use permit in accordance with article X of this Code: Reservoirs, pumping stations, standpipes or other water supply uses involving facilities located on or above the ground surface; Transformer stations, high voltage power transmission lines, substations, telephone exchanges, microwave towers or other public utility or communications use; Public or private facilities for nonintensive outdoor recreation; Day care centers accessory to public schools, religious facilities, multifamily or mixed-residential developments and mobile home parks; Private or commercial schools including business colleges without residential facilities; Municipal buildings and facilities; Nursing or convalescent homes; Boarding houses (up to nine persons). Space and bulk standards. Any building, structure or use of land or the creation of new lots within the medium-density residential district shall conform with the following requirements: TABLE INSET: ! " # ! $ ! $ # ---PAGE BREAK--- # ! " ( # ! ! # ! # , ! ! - - # ! ! ! - - - , - - - - - ---PAGE BREAK--- - - - - & - # & Additional standards. Any building, structure or use of land within the medium-density residential district shall comply with the following standards: The general standards of performance of article XII shall apply; Lots created as part of mixed single-family residential, mixed residential, or single-family cluster developments shall meet the minimum lot size, frontage and setback requirements set forth in article XIII; The construction of attached single-family dwellings or multifamily dwellings shall be permitted only if they are serviced by public sewerage; Prior to the division of any existing lot of record having a gross lot area of five or more acres, the owner shall file a master development plan with the planning director. The plan shall show in a conceptual manner significant manmade and natural features of the site, prime development areas and potential points of adequate vehicular access. The purpose of the plan is to assure that the remaining vacant land will remain suitable for the development of high quality multifamily and mixed residential housing and to preliminarily demonstrate how the standards of article XIII will be met. If the planning director finds that the master development plan does not meet the above requirements, the plan will be forwarded to the planning board for their review and determination of acceptability; The placement of mobile homes on individual residential lots, as outlined under subsection of this section, is permitted only in areas within a mobile home park overlay district; Modifications (ie. relaxation of standards) of setbacks, yards, maximum lot coverage ratios, maximum impervious surface ratios, minimum open space ratios, and maximum building height as contained in subsection may be granted by the board of appeals, planning board, staff review committee and the code enforcement official pursuant to articles V, VII, VIII, IX, and XIII of this Code. (Ord. No. 89-3, 4-7-89; Ord. No. 89-11, 9-15-89; Ord. No. 90-3, 5-17-90; Ord. No. 90-10, 10-4-90; Ord. No. 91-8, 10-3-91; Ord. No. 92-4, 2-20-92; Ord. No. 92-27, 11-19-92; Ord. No. 92-31, 1-7-93; Ord. No. 96-6, 7-4-96; Ord. No. 97-7, 9-11-97; Ord. No. 98-6, 7-2-98; Ord. No. 00-27, 1-11-01)