def get_list_b_nodes_without_area(city):
    """
    Returns list of building node ids without area parameter.
    Requires osm call to generate city obejct, first!

    Parameters
    ----------
    city : object
        City object generated with osm call

    Returns
    -------
    list_missing_area : list (of ints)
        List with building node ids without area parameter
    """

    list_missing_area = []

    for n in city.nodes():
        if 'node_type' in city.nodes[n]:
            if city.nodes[n]['node_type'] == 'building':
                if 'area' not in city.nodes[n]:
                    list_missing_area.append(n)

    return list_missing_area