uint16 x = (t->larger_town ?
                _settings_game.citymania.mapgen.custom_city_house_count :
                _settings_game.citymania.mapgen.custom_town_house_count);
    if (!x) return false;  // fall back to default generation

    // limited size generation
    int expected_size = t->cache.num_houses + x;

    int i = (int)x * 4, j = x;
    if (_settings_game.game_creation.landscape == LT_TROPIC ||
            _settings_game.game_creation.landscape == LT_ARCTIC) {
        i *= 4;
    }

    do {
        t->cache.num_houses = expected_size;
        UpdateTownRadius(t);
        GrowTown(t);
        j -= t->cache.num_houses - expected_size;
    } while (--i && j);

    t->cache.num_houses = expected_size - j;