I also installed a wood burning fire place that can be used but that isn't very practical to retrofit. 

Here, there is only a requirement for CO detectors if the house has a gas/oil/wood furnace, water heater, fireplace/fixture or appliance.One of the reasons we prefer to rent most of our student properties by the house or unit.  

I'm currently building a vacation rental and installed a gas fireplace that is thermostat or remote controlled and I really want to make sure it isn't accidentally left on when someone leaves.

Here's what we operate by:Landlord Responsibilities: Landlord will at all times during the tenancy keep the premises fit for human habitation, and shall in particular:a.Cultivate, care for and mow surrounding grass, lawn, flowers, and shrubberyb.Maintain the premises to substantially comply with any applicable code, statue, ordinance, or regulation governing the premisec.Maintain the roof, floors, walls, chimneys, fireplaces, foundations, and all other structural components in reasonable good repair as to be usable and capable of resisting normal loadsd.Keep any shared or common areas reasonable clean, sanitary, and safe from defects increasing the hazards of fire or accidente.Provide a reasonable program for the control of infestation by insects, rodents, and other pests at move in f.Except where the condition is attributable to normal wear and tear, make repairs and arrangements necessary to put and keep the premises in as good condition as at move ing.Provide reasonably adequate locks and provide keys to the tenanth.Maintain all electrical, plumbing (main lines), heating, and other facilities and appliances supplied by Landlord in reasonably good working orderi.Maintain the unit in reasonably weather tight conditionj.Provide facilities adequate to supply heat and water and hot water as reasonably required by the tenant

The following is some side information I want to share so if you have enough info please skip to the link.Back then it had a hole in the roof and holes drywall in a couple of units, which has been recently fixed.Other issues include: outdated kitchen(all 4 units), missing carpet in living room areas, rotted doors, needs repainted stucco on exterior walls and new paint interior as well, updated ceiling fans, and ceiling paint, updated Water heater and HVAC, replaced glass windows, repair door frames, overrun landscaping and trash, broken cement drivewayUnknown information: water/plumbing issues, electrical issues as it was winterized when I looked inside the home.Upgrades I want to add include: Security lighting/system,up-to-date kitchen, update fireplace molding, paint parking areas,update all entryway door and closets, carpets to laminate flooring, examine windows and doors for gaps to reduce heat loss, if need be examine plumbing electrical and heating ducts.Analysis:Quad plex in same neighborhood with same stucco construction and year  sold 4 months prior for 232K w/ no new updates just clean livable conditions. 2 Quadplexes that are brick construction and older  models but have been updated to 2015 and currently pending contracts for 315K.What numbers am i missing.

I bought a majestic electric fire place and shut up about it.

We'd ideally like to preserve some of the original detail like fireplaces and crown molding but only if the cost is not prohibitive.Any help would be appreciated!  

The structure created a safety hazard for the neighbors fireplace chimney.

Last night, the tenants on the other side (duplex) caught the fireplace ablaze and caused substantial damage to their side of the house.

I am getting my home ready to rent and I am not sure how to address the fireplaces.