This is the 11246th most frequent Spanish word.
entero
Whole; entire.
In this sentence, 'entero' is used as an adjective meaning 'whole' or 'entire,' indicating that the speaker consumed the entirety of the cake.
Hoy me comà un pastel entero.
Today I ate an entire cake.
Here, 'entero' functions as an adjective describing the document, meaning the speaker wants to read it in its entirety, not just parts of it.
Por favor, no tires ese papel; necesito leer el documento entero.
Please, don't throw that paper away; I need to read the entire document.
In this case, 'entero' is used as an adjective modifying 'building,' signifying that the renovation encompassed the full structure, not merely sections.