Hi
You do not need to hire an idministrator. In fact the Horizontal Property Act section 13, assumes that the Presiden is the administrator
"5. The functions of secretary and administrator shall be carried out by the president of the community except where the statutes, or the general assembly by a majority resolution, provide that such offices be held separately from the Presidency."
It is also possible to run the community by your own with a professional assistance from an administator.
Section 13 also state how to sack an administrator:
"7. The term of office for all governing bodies of the community shall be of one calendar year unless otherwise provided for by the community statutes.
The persons designated may be removed from their posts before the expiration of their term of office by a resolution of the general assembly, convened to hold an extraordinary session."
TRANSLATION INTO ENGLISH BY CASTILLO TRADUCTORES