Offer your solution and qualifications to the client's problem. Close the letter with a call to action (phone call or meeting).
1234, Main Street
Boston, MA 02123
08 April, 2005
<Recipient Address Goes Here>
<Problem statement> <Proposed solution> <Additional Detail.>
If you would like <offer for next step>, please call me at <phone number>. I will be happy to <action>.
encl: <List of enclosed items goes here>