Final answer:
The maximum height of a penthouse above a building's roof deck varies with construction type; for precise limitations, one should refer to the applicable building codes.
Step-by-step explanation:
The question pertains to construction regulations, specifically the allowable height of penthouses on buildings of various construction types.
According to building codes, the height limitations for penthouses can vary based on the construction type of the building. While specific code references would be needed for an accurate answer, a general guideline is that penthouses on buildings of other than Type I construction typically have restrictions to ensure they do not excessively exceed the height of the building's roof deck.
However, to provide a definitive height restriction number, one would need to consult the current building codes or regulations applicable to the jurisdiction in question, such as the International Building Code (IBC) or local amendments.