[1] In the latter position, he played a significant role in the establishment of the Saint Ladislaus Hospital in 1894, which specialized in the treatment of epidemic cases.

[1] As head of the Finance Department, Haberhauer participated in the organization of the 1896 millennium celebrations, which commemorated the anniversary of the Hungarian conquest of the Carpathian Basin.

In comparison to the "Golden Age" which characterized the significant part of the long-time mayoral period of Károly Kamermayer, Halmos had to face with economic downturn and deteriorated relationship between the city administration and the national government.

For the first time since the 1870s, the General Assembly approved frugal and less ambitious budgets in order to increase local government savings.

However still during Halmos' mayoral term, only limited and modest steps have been taken towards modernization, as the city administration did not assume political responsibility for drastically reducing the number of the staff.

[3] Despite the lack of visible successes, Halmos was awarded a title of royal counselor by King Francis Joseph in the spring of 1898.

[3] Since 1898, Halmos served as President of the Metropolitan Committee which was responsible for the Budapest pavilion at the site of the 1900 Exposition Universelle in Paris.

[7] The St. Stephen's Basilica, then the second largest church building in Hungary, was completed in 1905 after 54 years of construction, according to the plans of Miklós Ybl.

Accordingly, the General Assembly decided not to provide the collected taxes to the central budget, and also forbade Halmos to execute the government decrees.

[10] Both Márkus and Halmos disagreed with the resistance, thereafter the Minister of the Interior József Kristóffy declared void the General Assembly's decision.

Halmos was unable to pass his compromise proposal through the General Assembly, therefore, officially referring to his declining health, he resigned from his position on 17 February 1906, along with Lord Mayor Márkus.

János Hock noted Halmos gave an example "how to love our capital city, and how to work for its benefit with true enthusiasm and warm affection, unbreakable stamina and endurance and without representing particular interests".