TTHOUSES Duplexes in 78704

In an email dated 10/30/08 from a tenant leaving:

"Hi Paul,
Tomorrow is our last day.  We have some food left in the fridge and that is it.  I need to cut the electricity, so I will probably set it to be turned off this weekend sometime. 
Our new address is .............Austin, Tx  7870...
I have loved living in the Treehouse.  Being married now, we just needed a little more space.  John is just as sad to leave as I am.  Thank you so much for being a wonderful landlord.  I have not lived in any other apartment as long as this one.

I left a monogrammed towel there for you that says Treehouse.  My mom had it made.  Anyway, thought someone else might enjoy it. 
Should I just drop the keys in your mailbox?"