Hi guys can anyone help me get past this mission?

I already went to wiki and most of the walkthrough made sense. up to the part where im supposd to go to the man office. I dont see the man office. i just get pummelled by man agents. There has been a couple of times that the man agents knock me into where im supposed to go i guess(goes to cut scren), but at that point i have lost my weapon and cant beat the super man agent. I think it is close to the crosswalk but im not certain.

any help would be appreciated