I am pretty sure that is NOT Agave tequiliana... that species has vicious spines long the leaves that are among the worst of all Agaves (super sharp and hard to get out of the skin!)... I see no spines on your plant at all. It is a curious blue coloration. Agave sisalana looks exactly like your plant only not usually so blue. Perhaps a blue form of it?
Mexico here, Rosina but too embarrassed to participate. I can say that it is a beautiful agave. Actually I haven't paid much attention to agaves since i have lived here...i think because they are soooo common and also are not a plant of choice for a butterfly garden. my ignorance knows no bounds, i am so ashamed. Lots of agaves in sidewalk planting strips but i think they are mostly tequilanas. i'll pay more attention as i am walking around and will let you know if i come up with something.
There is not stalk at its base.. yet. I had an Agave sisalana for 7 years (until a motorcyclist mowed it down last year) and it had no signs of a trunk until the year it got chopped down (and then only noticable as a 6" trunk after it was mowed over). I have seen many Agave sisalanas at botanical gardens and in none can you appreciate any amount of trunk at this time, despite some even flowering already. So a trunk is only a potential characteristic...not a certainty. Still, the blue coloration is odd for Agave sisalana, so it might also be Agave weberi- some forms have no lateral leaf spines at all.