Killing only 5 agents? That's for noobs.
By doing this you also complete the Drive it home and Clean house challenges in one go.
To do this and get silent assassin suit only you need to knock out the two guards next to agent Thames like I did and make sure to kill the agents that would run to the front entrance (like I did).
![](https://i.ytimg.com/vi/d7Y5E0pmLuM/maxresdefault.jpg)