Learn Turkish: Asansör bu bina için çok önemli. - The elevator is very important for this building.

In English, "for" is a preposition and comes before the noun ("for this building"). In Turkish, için is a postposition, which means it must come after the noun or noun phrase it applies to, creating bu bina için.

Does the word bina (building) need any special case ending before için?

No. When için is used with regular nouns like bina or noun phrases like bu bina, the noun stays in its standard, unchanged form. Just remember that if you use personal pronouns instead (like "I" or "this one"), they do need the genitive case ending, as in benim için (for me) or bunun için (for this).

Where is the verb "is" in this sentence?

Turkish doesn't use a separate verb word for "to be" (am/is/are). Instead, you just end the sentence with your noun or adjective. Here, ending with çok önemli naturally means "is very important." You could add the factual suffix -dir to make it önemlidir, but this is optional and frequently left out in everyday sentences.

Since we are learning ordinal numbers, how would I change this to say "for the first building"?