The construction of Avenue Louise/Louizalaan was commissioned in 1847 as a monumental avenue bordered by chestnut trees that would allow easy access to the popular recreational area of the Bois de la Cambre/Ter Kamerenbos. However, fierce resistance to the project was put up by the town of Ixelles (which was then still separate from Brussels) through whose land the avenue was supposed to run. After years of fruitless negotiations, Brussels finally annexed the narrow band of land needed for the avenue plus the Bois de la Cambre itself in 1864. That decision accounts for the unusual southeastern protrusion of the City of Brussels and for Ixelles being split in two separate parts. Part of the Université libre de Bruxelles' Solbosch campus is also part of the City of Brussels, partially accounting for the bulge in the southeast end.
Brussel Grand Place
At first, the City of Brussels was simply defined, being the area within the second walls of Brussels, the modern-day small ring. As the city grew, the surrounding villages grew as well, eventually growing into a contiguous city, though the local governments retained control of their respective areas.