The tender to construct the Legislative Building was won by two engineers, Gustav Heine and George Hagenmann, from Hannover. The building construction started on May 29th, 1883.

From the moment Buenos Aires' city territory. Was transferred to the Federal Government until the new legislative building was inaugurated, the provincial Legislature would hold its sessions in a building in which the Provincial Department of Roads and Highways, a body responsible of the provincial road and routes management, currently works.

On May 4th, 1888, the first Meeting in the new building, in which both, the House of Representatives and the Senate were called to participate in opening session of that year, was held, and the new Legislative Building was thus inaugurated.

This Legislative Building belongs to Renaissance style, which was commonly used in those days for public buildings as a symbol of the State Power. The Legislature results in one of the most meaningful and significant constructions of the urban architecture achieved in Argentina, created by the architects Mr Heine and Mr Hagemann, and its work directed by Charles Nordmann, all of them from Germany, as these authors had won the first prize in the international tender made for that purpose, in 1882.

This architectural work – a singular building with a sequence of three identical porticos for the functions assigned: a central and most important one from the strategic point of view, placed at Avenue 7, thought for the public entering, then one on the House of Representatives’ side, at Avenue 53 and the other one on the Senate’s side, at Avenue 51- together with the Museum of Natural Sciences, the Government Building, the Teatro Argentino (an Opera House and theatre), the Municipality, the Cathedral, and the Judiciary building, are part of the assets and constitute part of architectural riches of the city of La Plata, deserving thus a true zeal for their conservation as patrimonial values.

These three entrances show the same architectural profile. They are situated onto marble staircases, with four ionic columns which work as a base of a façade. On each of these accesses, a group of sculptures which stands for the moral and spiritual beauty can be seen, pieces of work made by the Venice painter and sculpture, Victor Pol (1865-1925).

In the mid of the last Century, the adjoining block, situated within the Institutional Axis of the City, between street 8 and 9 and Avenues 51 and 53 were thought to be expropriated; however such initiative failed to be achieved. Being the possibility of ‘extramural’ enhancing of the Legislative Building rejected and having the lack of room worsened, the Building was eventually extended by means of a semicircular enlargement in the yard, in which a two floor bay whose sides faced 8 Street and Avenues 51 and 53, taking in part of the yard and two basement levels below them, was built.

Together with this enlargement, the original façades which face the yard disappeared as well as its staircase. A mitigating factor, worth mentioning, is that its general style was followed with a good construction quality. This failed to happen when performing subsequent expansions, which also resulted in inside modifications. The latter were done without certainly any respect of its original architectural style, to the extent that any attempt to alter them makes inconsiderable any possible recovery.