Please answer the following question by reasoning step-by-step.
His long walk home wasn't over, he lived on the tenth storey of a walk up what?\nOptions:\n- skyscraper\n- book of stories\n- tall building\n- apartment building\n- mall

apartment building
Apartment building was his long walk home.

He lived on the tenth storey of an apartment building.

.

So, the final answer is apartment building