You have asked multiple queries which is not allowed in forums and hence I am answering the first part i.e. how to get Lattitude ad Longitude when some building is clicked, rest you can ask a new question.
<script type="text/javascript" src="http://maps.googleapis.com/maps/api/js?sensor=false"></script>
<script type="text/javascript">
window.onload = function () {
var mapOptions = {
center: new google.maps.LatLng(18.9300, 72.8200),
zoom: 14,
mapTypeId: google.maps.MapTypeId.ROADMAP
};
var infoWindow = new google.maps.InfoWindow();
var latlngbounds = new google.maps.LatLngBounds();
var map = new google.maps.Map(document.getElementById("dvMap"), mapOptions);
google.maps.event.addListener(map, 'click', function (e) {
alert("Lattitude: " + e.latLng.lat() + "\r\nLongitude" + e.latLng.lng());
});
}
</script>
<div id="dvMap" style="width: 500px; height: 500px">
</div>
Demo
