It sounds expensive, but perhaps the property falls under certain requirements, including interconnecting the detectors.Maybe this can shine some light:https://wbcapp.oaklandnet.com/cs/groups/public/documents/translateddocument/b3dk/mdaz/~edisp/dowd003911.pdf

And everything is interconnected w conduit.

Cash flow and cap rate are interconnected.

@Jeff PratherYou have several questions and the answers will be interconnected.1.  

We plan on starting small, little by little, and being able to grow into a vast network of interconnected artistic hubs!

Other code requirements may include interconnected smoke/CO detectors, fire/smoke rated doors and a fire/smoke barrier separating the two units.

Used to the woods would be called the "thousand acres" and you could ride your bicycle down the interconnecting dirt roads in the woods to Allatoona lake.

To add the unit you will most likely need to achieve proper fire rating between shared walls/floors/ceilings and have interconnected smoke detectors.

Though it was laid out like a side by side the entire property was interconnected.   

Smoke detectors have to be interconnected and where they need to be placed, are any extension cords being used improperly, are the outlets all working properly.