The Board of Playground and Recreation Commissioners, in the exercise of sound and reasonable discretion based upon compliance with the provisions of this article and based upon the effect the proposed or existing structure may have or has had upon any of the rights or interests of the public, and of its effect on the public beach land, may grant or deny any and all applications to construct, maintain, repair or operate any of the structures mentioned in Section 63.08 for which an application has been made; provided, however, that the Board of Playground and Recreation Commissioners must grant or deny any application within sixty days after the date of the filing of the same.