Well, not to mention Linkara's video reviews of the first four issues, wish he'd do video reviews of the other issues.
Batman: This is still the best Batman book of the bunch. Batman investigating an Illuminati conspiracy? Hell yeah, sign me up.
So, if I understood things correctly the Wayne family has a tradition of a Trumpian superstition of not having a thirteenth floor in their buildings. But so that there is
a "thirteenth floor", so that there'd be logic in there being a fourteenth floor, there's a "dead space" between the 12th and 14th to serve as the numerical floor. In this "dead space" operates the Parliament of Owls using the dead space as somewhere to spy on the business dealings of the occupants of the building.