This is the 12001st most frequent Russian word.
зданию
"Зданию" is the dative case form of the Russian word "здание," meaning "building."
In this sentence, «зданию» is used as a noun in the dative case, indicating motion towards the building.
Мы подошли к зданию, где проходила конференция.
We approached the building where the conference was held.
Here, «зданию» is in the dative case, which is used to express an indirect object needing a subject, in this case, renovation. This usage conveys the necessity directed towards the building.
Зданию требуется капитальный ремонт из-за старости.
The building requires a major renovation due to its age.
The word «зданию» in this context is used in the dative case to express the indirect object of the verb, indicating the entity that caused the speaker's emotion.