I know I'm late to the party and this is waking a dead page however.

The script already does the following:
Rolls a 100 sided die and if its 30 or less it does:
Line 41:
C#:
switch ( Utility.Random(4) )
Which is Deciding which of (Castle, Keep, Tower) to give to the player.

However there are only Three options, so unless you change the 4 to a 3 you have a rare 1 in 4 chance that if the player is lucky enough to roll for one of the good mini houses they instead get nothing at all.
 
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