"There are also banks and stores in the big buildings."
Translation:A nagy épületekben bankok és üzletek is vannak.
Placing is behind a verb is ungrammatical in most cases. Is is normally placed behind the noun it refers to, and if you want to say that some action "happens as well", you place is in front of that verb. So the spot after the verb is a forbidden place.
"Bankok és üzletek is" should stay together like this in this sentence, meaning "banks and also shops" or "also banks and shops".
The stressed, most important word (or the one that answers a question that has just been asked) always comes right before the verb.
The verb does not have to come at the end.
For example, the following two orders are both fine. They both stress fiúk (you're trying to tell the listener WHO is studying):
A fiúk tanulnak most.
Most a fiúk tanulnak.
The following two orders are also both fine. They stress most (you're trying to tell the listener WHEN the boys are studying):
A fiúk most tanulnak.
Most tanulnak a fiúk.
Putting the verb right at the beginning of the sentence would tend to stress the verb itself. So the following sentence is also fine:
Tanulnak most a fiúk.