Will the .lower function in an if statement interrupt the correct input?

Python3 noob here. In the below code I expect if I enter "window" for the choice1 input then it would move on to the input prompt for choice2. But what I get instead is the else statement at the bottom, "You fell into a spike pit as you entered the house! Game Over." What am I doing wrong? Thanks

choice1 = input('You are in front of the house, which way do you want to enter? Type "front door" or "window" and hit Enter \n')
if choice1.lower == "window":
    choice2 = input('You snuck in through a window. You come to the foyer and can take the staircase upstairs or down to the basement. Type "basement" or "upstairs" and hit Enter to proceed \n')
    if choice2.lower == "upstairs":
        choice3 = input("You go upstairs and are in a hallway with 3 doors to enter: 1 red, 1 green, 1 blue. Which color door do you choose? \n")
        if choice3.lower == "red":
            print("The room is full of poisonous snakes! Game over.")
        elif choice3.lower == "green":
            print("You found the lost trick-or-treaters and lead them out of the haunted house to safety. You win!")
        elif choice3.lower == "blue":
            print("You ended up in a warewolf's room. It eats you! Game over.")
        else:
            print("This door doesn't exist... Game over.")
    else:
        print("You encountered a witch who cast a spell turning you into a rat! Game Over.")
else:
    print("You fell into a spike pit as you entered the house! Game Over.")```