This is a perfect opportunity to get the customer on your home turf and show off your company and products.
1234, Main Street
Boston, MA 02123
08 April, 2005
<Recipient Address Goes Here>
The best way for you to understand what Abc Company has to offer is to invite you to visit our <type of facility>. While <here/there> you will have an opportunity to <features and opportunities during tour>.
I'll call you <time frame> to set up a time for <invitees> to visit our <type of facility>. If you would like to speak with me sooner, please feel free to call me at <phone number>. We look forward to your visit.
encl: <List of enclosed items goes here>