[10] From this decade it also assumed the assignment of the Council of State, an advisory body headed by the prime minister, and in 1870 the statistical, geographical and cadastral powers definitively transferred to the Ministry of Development.

From 1865 to 1870 several reforms were made to the Office of the Prime Minister to resemble a ministerial department, including the creation of an undersecretariat.

In 1871 the Presidency was moved to a central property in Madrid, known as Casa de los Heros, and it was established a new budgetary item for the conservation and maintenance of the building.

[12] To ensure compliance with the law, the Commission for the Protection of National Production was established, which was attached to the Presidency.

Likewise, in 1914, the Office of the Civil Comptroller for War and Navy and for the Protectorate of Morocco was created in this department.

[21] In 1968, a series of decrees were approved that reorganized the services of the Presidency, establishing six management bodies —Undersecretariat, Commissariat for the Economic and Social Development Plan, Technical General Secretariat, Directorate-General for the Civil Service and the Directorate-General for the Geographic and Cadastral Institute—, five consultative and advisory bodies —Council of State, Council of National Economy, Higher Personnel Commission, Advisory Commission for Scientific and Technical Research and Commission for Income and Prices—, three organizations autonomous bodies—National Industry Institute, the National School of Public Administration and the Official State Gazette—and six other organizations of different categories.

[22] In 1973, the dictator decided to separate the Presidency of the Government from the Head of State, appointing Luis Carrero Blanco as prime minister.

[6] The current structure of the Office of the Prime Minister is regulated in Royal Decree 890/2023, of November 27:[27] In accordance with the National Heritage Regulatory Act of 1982 and Royal Decree 204/2024, which develops the structure of the Ministry of the Presidency, the Patrimonio Nacional agency is attached to the Prime Minister's Office through that department.

In 1914, during the reign of Alfonso XIII, the government purchased the Palace of Villamejor from Infante Carlos de Borbón-Dos Sicilias, who had owned it since 1906.

[30] The Moncloa Palace had been rebuilt during the dictatorship, since the Civil War completely destroyed it and since the 1950s it had acted as the residence of foreign heads of state who visited the country.

Currently, the Moncloa Government Complex consists of 16 buildings,[31][32] and also houses the headquarters of the Ministry of the Presidency.

Thus, for the fiscal year 2023, extended to 2024, the Office has a budget of 134 million euros, participating in two programs of the aforementioned Ministry:[33]