Also check your local codes, they may require upgrades like interconnected smoke detectors and AFCI "Arc fault" breakers.

See below:I currently use the interconnected hardwired smoke and carbon monoxide alarms in my units with 10 year sealed batteries to satisfy the current, and hopefully future, requirements.

If I were to map our all of the interconnections between customers and referrals in my service business over the past 10 years, it would look like one of those chaotic tactical FBI crime web boards from the movies where the lines crisscross too much to even track. 

There is an interconnected group of players there, and I bet you and I  have come across the same names.

So, I will have 3 inter-connected cabins.

Put them up on your wall and interconnect them with strings to weave a timeline of deceit.

Many of these type of exams require a certain amount of fire alarms that are interconnected, window size for emergency egress, etc.

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.