UP 1.5 - Genie Editor - Feitoria ability

I am trying to create houses that generate gold, but drain food.

With absolutely zero documentation available, I tried to give the house task 151 - copied directly from Feitoria. No effect.

I tried to match all sorts of values from Feitoria to House, workrate, resource capacity, etc. all to no effect.

I even copied Feitoria directly into a new building unit, changed the IDs for everything, and that still worked, so its not hardcoded.

I suspect some background magic going on the background much like unit regen uses attributes 40 and 45 to achieve that. Anyone have any idea?