Learn Spanish (Latin America): Aquí no se autoriza el préstamo.

The verb in this sentence is autorizar (to authorize). Because it ends in -zar, the yo form in the preterite past tense needs a spelling change. You change the z to a c before adding the ending, making it autoricé.

Why is there a se before autoriza?

This uses the passive se. We use it when the person doing the action isn't important or isn't specified. Instead of saying who exactly isn't authorizing it, no se autoriza translates smoothly to 'is not authorized'.

Why is el préstamo at the end of the sentence?

In Spanish, especially with the passive se, it is very common to put the subject (el préstamo) after the verb. You could also say El préstamo no se autoriza aquí, but putting the subject at the end sounds very natural to native speakers.

Are préstamo and prestar related?

Yes! Prestar is the verb meaning 'to lend' or 'to loan', and préstamo is the noun meaning 'a loan'. Notice that the noun has an accent mark on the first syllable to show you where to put the stress when speaking.