Yes, I seem to remember the first house was placed near the Moonglow gate- Thunderlips sounds right.
The first DTA house that was placed is still there- the small shop now called The Red Skeleton, owned by Quira- south of the Trinsic gate. That house was placed (improperly) by Bruenor, the original GM of DTA, and owned first by True Grit. I have owned it a few times. It has always belonged to a DTA member.
It was set up as our first vendor house- but was a magnet for pvp. There was another guild that lived near there that used to attack anyone who wore platemail - but I can't remember the name of that guild- anyone remember them?
When I placed my vendor house near the Yew gate, there were only 3 others houses there.
We stood around wondering if anyone would ever come there to shop. Later, Yew gate became the best shopping area on the shard. That original location has shifted many times and is no longer in the original place.