Yes, the original present day passenger terminal was built in 1970s. It's the terminal shown in the photos above. ( Prior to that time, the passenger terminal was in the present day FBO. Also shown in an above photo. *The brick building with control tower.) All terminal expansions since then have been added onto this original building.
The baggage claim was in the far left end of this 1970s building and it remains there today, although renovated with the last eight years. Check in and ticketing desks were on the lower level where they remained until last year. An escalator took passengers upsairs to go through security to the gates. There was also a small gift shop, an arcade, restaurant /bar, and a waiting/viewing area in the corner of what is now the area immediate to gate 3. I spent many hours there with my scanner as a teen watching planes as my parents shopped at the nearby mall.
Prior to 9/11 there was next to no baggage sscreening. Your bag was tagged and put out onto the belt behind the ticket desk, and away it went to the back rooms resembling garages behind the counter. There it was loaded onto carts and taken out to the planes.
Around 1984, the third expansion extended the terminal west. For those familiar with the terminal prior to the newest extension, this extension started at where the old Delta check in desk was. (Prior to the 1984 extension,there was just a wall there to the right of the desk .) at this time 2 or 3 jetways were added. The next significant expansion occurred in 1996. Two more gates were added to the west corner of the terminal. These became US gates. A small customs processing area was also constructed in terminal at this end of the building.
Little else happened as far as expansion until the most recent addition. However, in 2004 the main runway was extended, repaved and had in pavement centerline lighting installed. Also, the ILS system was upgrade to CAT II
from CAT 1.
In this photo taken about a decade ago, if you compare it to the 1970s one above, you can clearly see the 1980s and 1990s expansions. The roof is dirtier on the older part of the building.
[Edited 2013-01-03 11:11:23]