Greg Svenson began as a player with all the others but during the later part of the first year, he really began clicking and had a character that has been in the game ever since that date. He plays more than most but rather than take great risks, runs to fight another day. Thus, although incredibly long lived, he is still only 15th level.
In his early days, Greg built a small keep for himself and some friends (all from Carr's FITS society group) and herein are the plans of that edifice. It was destroyed once (the 2nd time Blackmoor fell) but was rebuilt in total.
Dave Arneson, The First Fantasy Campaign
"The Great Svenny" is described in "Blackmoor's More Infamous Characters". Carr's FITS society group refers to Mike Carr's "Fight in the Skies" society.
Svenson stated "I did the floor plans when I was taking an architectural drafting course in the Spring of 1972." in this thread on the Comeback Inn discussion boards.
Plan for the 2nd floor of Svenson's Freehold, from JG 37 "The First Fantasy Campaign". Note "Sgreg" (Greg Svenson's) room in the center.
"Zvenson's Room", denoted "Sgreg" in the plan for the 2nd floor of Svenson's Freehold.