%\documentstyle[newlet,ncs,personal,12pt,margins]{letter}
\documentstyle[newlet,ncs,12pt,margins]{letter}
\stdsizes
\begin{document}
%\address{72 Marathon Street, \#2 \\ Arlington, MA~~02174}
%\address{3124 Yosemite Ave. \#3 \\ El Cerrito, CA~~94530}
\address{MIT Room E40-300 \\ 77 Massachusetts Avenue \\ Cambridge, MA~~02139}
\signature{John T. Kohl}
\begin{letter}{Addressee}
\opening{Dear Foo,}
Body goes here.
\closing{Sincerely,}
\end{letter}
\end{document}