Your sentence
Es+el+edificio+más+alto+de+la+ciudad.
Words in this sentence
el
masculine singular definite article; the; feminine singular definite article used before nouns which start with a stressed /a/
Article
más
more; -er (used to make comparisons); most; -est (used to make superlatives); furthermore; in addition; else; used with qué to express emphasis
Adverb
de
of; 's; used after the thing owned and before the owner; from (with the source or provenance of or at); of (expressing composition, substance); about (concerning; with regard to); of; from (indicating cause); of (indicates a quality or characteristic); from (with the origin, starting point or initial reference of or at); of (indicates the subject or cause of the adjective); from (with the separation, exclusion or differentiation of); than (in certain phrases); …
Preposition