Mass. Gen. Laws ch. 272, § 86: Stabling horses or mules on second or higher floors, in places other than cities

Section 86. No person shall stable a horse or mule on the second or any higher floor of any building, unless there are two means of exit therefrom, at opposite ends of the building, to the main or street floor, unless such building is equipped with an automatic sprinkler system. This section shall not apply to cities.