This is one of those unique features you don't see anywhere else in the Hotel Boulderado -- a window in the wall between the bedroom and bathroom. We are not entirely sure what the purpose of this window is. However, one theory from a "lifer" (a Boulderado employee of 15+ years) is that the window provided natural light for the private bathroom. She believes room 300 was the only hotel room from the original floorplan that offered a private bathroom -- a true luxury in 1909. She also believes it would be logical to install an extra window to provide this private bath with natural Colorado sunshine if it was indeed the most luxurious room available.
Honestly, this is how we figure out a lot of things at the Hotel Boulderado about our own history. Many times, when a question is asked, there is no answer written down in the history book or our own records. We have to use logic, supposition, and our own knowledge of the period, Boulder, and the hotel to figure things out the best we can.