Not sure what I'm doing wrong here. Fails extras.

def house(plan):

    # excepts no building
    if '#' not in plan: return 0

    # excepts 1 building
    if (plan.count('#')) == 1: return 1

    # splits string into list of strings
    new = plan.splitlines()

    # removes buildingless rows
    while '#' not in new[0]:
        new.pop(0)
    while '#' not in new[-1]:
        new.pop()

    # rotates array
    new2 = ''
    for i in range(len(new[0])):
        for x in range(len(new)):
            new2 += new[x-1][i-1]
        new2 += '\n'

    # splits string into list of strings
    new2 = new2.splitlines()

    # removes buildingless rows
    while '#' not in new2[0]:
        new2.pop(0)
    while '#' not in new2[-1]:
        new2.pop()

    #return area
    area = len(new2) * len(new2[0])
    return area


if __name__ == '__main__':
    print("Example:")
    print(house('''
0000000
##00##0
######0
##00##0
#0000#0
'''))

    #These "asserts" using only for self-checking and not necessary for auto-testing
    assert house('''
0000000
##00##0
######0
##00##0
#0000#0
''') == 24

    assert house('''0000000000
#000##000#
##########
##000000##
0000000000
''') == 30

    assert house('''0000
0000
#000
''') == 1

    assert house('''0000
0000
''') == 0

    assert house('''
0##0
0000
#00#
''') == 12

    print("Coding complete? Click 'Check' to earn cool rewards!")