After the addition, the next change was a complete redesign of the top floor bathroom. A bathtub was added—making two in the house—along with a granite topped vanity sink and a high-tech toilet that flushes like you were on an airplane. The artisan tilework on walls and the floor is particularly striking. Deep storage shelves behind the tub are great for linens and blankets.
The 4th level master bathroom, in contrast, has been preserved with great effort almost exactly as it was built in 1953. Except for Corian walls that were added, it is a mid century gem. Although nostalgic, it is also small by modern standards and rather old fashioned. There is no double sink, no exhaust fan (because of the window), and no electrical outlet (although wiring is accessible behind the medicine cabinet).
It would not be difficult to expand that bathroom into the master bedroom if those amenities were wanted. Or else one could expand it into the hallway, as far as the stairs to the top floor, where the linen closet is now. Ozzie and Harriet did not need those frills, however, so why would you?
The most distinctive thing about the three bedrooms on the 4th level is that each one has a huge closet, far larger than was common in that era. It must have been a special request when the house was custom built. The smallest bedroom has the largest closet, part of which extends north over the main floor coat closet.