It is still an unpolished gemstone, but it will soon become a red ruby with 137 small apartments in Frankfurt-Niederrad. Cube Ruby 923 owes its illustrious name to its future ruby-red façade, which will turn the 3,100 square meter, sustainably revitalized building from the 1970s into a real eye-catcher. Young professionals, students and even employees working temporarily in the Main metropolis will find a home in the real estate gem realized by Cube Real Estate. Incidentally, the modernized building will only require 55 percent of the energy that a new building must have today as an efficiency standard. This means that the red ruby of Niederrad has a significantly better CO2 balance than the outdated original building.