The Treaty of Brussels, signed on 17 March 1948 by Belgium, the Netherlands, Luxembourg, France, and the United Kingdom, is considered the precursor to the NATO agreement.
These talks resulted in the NorthAtlanticTreaty, which was signed in Washington, DC on 4 April 1949.
The meetings of the NorthAtlantic Council are chaired by the Secretary General of NATO and, when decisions have to be made, action is agreed upon on the basis of unanimity and common accord.
When the flag of Spain has the usual proportions, a length of three halves its width, the [vertical] axis of the coat-of-arms shall be placed at a distance from the hoist of half the flag's width.
In Toledo, the flag of Castile-La Mancha was commonly flown, again often appearing alongside the European and Spanish flags with the latter centered and higher.
In fact, I only saw two Spanish flags in the city one on the Palacio de Justicia where it appeared along with the Basque and European flags, centred and higher than the others; and the second on the main post office where it was flown to the left of the Basque flag.