This mission is unlocked right after you visit the Theater and is a Main Mission
*Spoilers Below*
1 Leave the Theater and follow your GPS to reach the Grand Washington Hotel
2 Defeat the enemies in your way then locate the service entrance
3 Open the door and head down into the laundry room
4 Exit the laundry room and go up the stairs through the kitchen and into the atrium
5 Secure the atrium by defeating the enemies in the area then go through the door to head upstairs
6 Pass through the hallway until you reach the stairs to the conference room
7 Go into the conference room & defeat the enemies
8 Once the area is secure, go into the double doors & move forward until you reach the elevators
9 Head inside the elevator and head through the burning parts of the building
10 Find the door that leads to stairs - go up and through the hotel hallways to reach the security room
11 Pass through the security room and up the stairs to reach the rooftop
12 Vault over the blockade and locate Agent Kelso
13 Defeat Saint's Henchmen to draw out Saint
14 Defeat Saint once he appears
15 Go into the rooftop room to rescue Eleanor Sawyer
16 Find the elevator & go back down to the atrium
17 Use the mounted machine gun to destroy the barricaded door
18 Once the door is open, defeat the remaining enemies in the atrium
19 When all enemies are gone, the mission will complete
Credit:
https://gamewith.net/division2/article/show/8366