A western extension, commonly known as the Extension Canal, was begun in 1840.

In 1995, overcrowding at Indian River forced the school to add an extension, known as the "new wing".

The two new extensions, known as top-level domains, will be the first introduced to the address system since it became operational in the mid-1980's.

There also exists an extension known as Madaline.

It stands outside the old city in the 19th-century extension known as the Eixample, not far from the Monumental bull ring.

Another extension, known as Piazza, was opened in 2001.

In 1999 a further extension, known as the Octagon was built.

The extension, known as the Central Subway, is currently scheduled for completion by 2019.

The oldest part of the house is the eastern extension known today as the kitchen wing, a one-and-a-half-story frame structure on a stone foundation.

There are also extensions to it, known as vCalendar or iCalendar.