Certain public uses excluded. This chapter shall not be construed to limit or interfere with the dedication, development or use of any land or building as public parks, playgrounds or schools required for compulsory education, or with the use of land or buildings owned by the United States government, State of New York, County of Erie, Village of Williamsville or the Town of Amherst and used for governmental purposes, or with the construction, installation, operation and maintenance for public utilities existing or hereafter authorized, and shall not be interpreted to permit yards, garages or structures for service or storage unless permitted within the district.