I updated the list with Mansion info. Upgrading it to Type A did little to increase its net worth.
Now with the gold building list more or less complete, a trend becomes apparent, with my opinions in parenthesis:
1. The "free" buildings, Basketball Court and Ice Cream Shop, offer above average value overall (perhaps to act as a teaser to buy more gold).
1. The "free" buildings offer radically above average value over their low-level contemporaries Techno Club, Mansion, and Empire Theater. In general there is a stiff penalty for buying gold buildings early (perhaps to avoid a situation where a value seeking player could rapidly stockpile cash early on or to encourage even further investment in gold).
2. There is a discount in buying later gold buildings (probably to appeal to higher level players who need greater incremental value to make a purchase).
To revise my recommendations based on level:
36 and under
Smoke Shop (one of the best values for the level in the game)
Ice Cream Shop
Chicken & Waffles
Basketball Court if space is not a concern
48 and under
Gaming Parlor
Anchor Imports (marginal)
55 and up
Everything new is worth the cost