- (BOOL)mapView:(GMSMapView *)mapView didTapMarker:(GMSMarker *)marker {

    if (marker.userData) {
        Property *property = marker.userData;

        [[MessagesManager sharedInstance] showSpinner:self.view];

        ...

        return YES;
    } else {
        return NO;
    }
}

if ([_points count]) {
    GMSMutablePath *rect = [GMSMutablePath path];
    [rect addCoordinate:_startDrawingPoint];
    for (id location in _points) {
        float lat = [[[_points objectForKey:location] valueForKey:@"lat"] floatValue],
        lng = [[[_points objectForKey:location] valueForKey:@"lng"] floatValue];
        CLLocationCoordinate2D coordinate = CLLocationCoordinate2DMake(lat, lng);

        [rect addCoordinate:coordinate];

    }
    GMSPolygon *polygon = [GMSPolygon polygonWithPath:rect];
    polygon.fillColor = [UIColor colorWithRed:0.25 green:0 blue:0 alpha:0.05];
    polygon.strokeColor = [UIColor blackColor];
    polygon.strokeWidth = 2;
    polygon.map = _mapView;

}