The code should be adding a new building, very common for testing purposes to the level up options of a fortress. It is not showing up as an option.
<AbilityBonusOption InternalName="UnlockPsionicTrainingAcademy">
<DisplayName>Psionic Training Academy</DisplayName>
<Description>Unlock the mental forces latent in your race. All units trained here will have the psionic bolt trait, allowing them to attack the minds of their enemies.</Description>
<Icon>K_Oracle_Thumb_01.png</Icon>
<GameModifier>
<ModType>City</ModType>
<Attribute>UnlockImprovement</Attribute>
<BoolVal1>1</BoolVal1>
<StrVal>PsionicTrainingAcademy</StrVal>
</GameModifier>
<HideWhenUpgraded>0</HideWhenUpgraded>
<Likelihood>10000</Likelihood>
<RarityDisplay>Rare</RarityDisplay>
<RequiredLevel>3</RequiredLevel>
<Prereq>
<Type>AbilityBonusOption</Type>
<Target>City</Target>
<Attribute>UnlockFortress</Attribute>
</Prereq>
<AIData AIPersonality="AI_General">
<AIPriority>5</AIPriority>
</AIData>
</AbilityBonusOption>
And later, under improvements,
<ImprovementType InternalName="PsionicTrainingAcademy">
<DisplayName>Psionic Training Academy</DisplayName>
<Description>Units trained in this city posess the ability to attack their enemies psionicly</Description>
<RequiresCity>1</RequiresCity>
<RequiresForceUnlock>1</RequiresForceUnlock>
<BarredTerrain>River</BarredTerrain>
<BarredTerrain>SwampTerrain</BarredTerrain>
<PreferredTerrain>City</PreferredTerrain>
<PreferredTerrain>Category:Land</PreferredTerrain>
<PreferredTerrain>Forest</PreferredTerrain>
<RequiresCityImprovement>1</RequiresCityImprovement>
<RequiredImprovement>Fortress</RequiredImprovement>
<LaborToBuild>0</LaborToBuild>
<GameModifier>
<ModType>CityTrainingBonus</ModType>
<Attribute>TrainingBonus_ApplyAbilityBonus</Attribute>
<StrVal>PsionicBoltAbility</StrVal>
<Provides>Trained units can utilize the psionic blast ability</Provides>
</GameModifier>
<AIData AIPersonality="AI_General">
<AIPriority>5</AIPriority>
<AITag>CommandPost</AITag>
</AIData>
<ArtDef>Art_Watchtower</ArtDef>
</ImprovementType>
