A Skyscraper Observatory is different compared to a conventional domed observatory. It has protective sub walls and a partial sub ceiling, yet remains in full view of the night sky in a selected orientation such as East to South plus East to North inclusive of the Zenith.
Not any skyscraper will work, as tall narrow structures are often in great constant motion and vibration due to the ruler effect. Some floors as low as level 6 are known to cause motion sickness. These narrow skyscrapers amplify small motions, earthquakes, local traffic, trains, buses, construction sites, and underground subways. Some telescope companies offer anti-vibration pads to help reduce vibrations. These may work best at specific harmonics.
The best structures are newer, more expensive, quad wide, stable, and don't have the problems associated with the former. Many of these new quads are so well built, top-most safety roof access is granted for spectacular nighttime all-sky observing. New quad designs also have elevators leading to the top, while decades and older buildings have elevators that may stop and require an additional six flights of stairs to reach the top! Older skyscrapers may have roofs that are not safe near the edges. An errant high gust of wind could potentially lift a bystander and cause a plummet to the death! Many are banned from going rooftop due to a form of suicide. Observe all roof-top precautions.
Some trends in skyscrapers are notable. Oldest buildings had windows covered in metal bars. These were often modded over the years to include the attachment of bar cages to hold potted plants, a few items, and a small clothes line. The next generation skyscraper included a small narrow deck for a washing machine capable of supporting more substantial weight. These designs spawned many variations of patio/decks. (curved, rectangular, open, closed, caged, partial walled, ceiling, no ceiling, sides, no sides, fenced, blocked...) Following, modern skyscrapers were born of two designs. One design has no deck with the washing machine located indoors in the kitchen, and another design has one or two usually opposing larger decks. Generally the smaller deck is for the washing machine and hanging up clothes while the larger deck holds an unobstructed majestic skyline view. It's this latter design that's perfect for a skyscraper observatory.
