\documentclass[letterpaper,oneside]{letter}
\usepackage[letterpaper]{geometry}
\newcommand{\acldm}{Asociaci\'{o}n Colonos Lomas del Manglar, A.C.}
\newcommand{\ldm}{Lomas del Manglar}
\begin{document}
\begin{sffamily}
  \pagestyle{plain}

  \begin{center} {\huge \acldm }

    {\LARGE Timothy Napier Whiting, - Presidente\\
    La Gaviota \#29\\
    Lomas del Manglar\\
    Chapala, Jalisco C.P. 45900\\ }

  \end{center}
  \begin{flushleft} 

    {\Large \hfill \today\\
    Lote \#34, Lomas del Manglar\\
    Chapala, Jalisco C.P.45900\\

    To Whom It May Concern:

    All association dues and water overage fees for the
      property on Lote \#34 have been paid in full and nothing is
      owing.  The association dues for the year 2013 were paid on 3
      January 2013.

    Respectfully,

    Henry Herman Laxen

    Secretary 
    }

  \end{flushleft}
\end{sffamily}
\end{document}