Penthouses are the top floor units in an apartment building while the lower ones are called as basement suites. These are different from other apartments by luxury features. These are the largest and the most luxuriously built homes within a given building, which have the most expansive views. It has high ceilings and gets personal access to the terrace and is expensive than the other kinds of apartments. Penthouses epitomize the pinnacle of high-end luxury living with breathtaking views all around.