Similar but unique terminology. Base line, my question is can we benefit from one unenclosed exit within the mezzanine? Yankee Chronicler mentioned: A mezzanine must be in a space or House. If this "mezzanine" is enclosed and both equally implies of egress discharge straight to the outside, IMHO it isn't https://cablepuller53724.bloguetechno.com/how-much-you-need-to-expect-you-ll-pay-for-a-good-mezzanine-gate-74442297