Such improvements shall be constructed or installed along all public streets and alley frontage adjoining the land upon which the structure, building, dwelling, public or semi-public parking lot is to be constructed unless adequate curbs, gutters, paving, sidewalk, drainage facilities, sanitary sewers, street signs, street lights, street trees, medians, underground electrical transmission lines, rubberized rail crossings, improved medians, water mains, and gas lines, already exist along the street and alley frontage. Where additional right-of-way or easements for public purposes are required, the right-of-way or easements shall be dedicated without cost to the city. In the case of gas lines, water mains, electrical transmission lines, drainage facilities, and sanitary sewers, the facilities shall be constructed so as to connect to the nearest accessible existing facility.