My doubt is with respect to this sentence (in perfect)
Er ist zum Büro gegangen.
My teacher taught me that we have to use the verb sein as helping verb whenever there is a movement. However, why do we use a dative preposition zu + dem rather than an accusative preposition in + das? Isn't the verb gehen an accusative verb?
What is wrong with the following sentence?
Er ist ins Büro gegangen.