Not sure about those two cities, but some require hard-wired, interconnected smoke detectors - costs more to put in than regular battery operated...Also, generally to North Texas:  it gets damn hot down here, so HVAC systems take more of a beating. 

As a rehabber, my BS detector goes off every time I hear a wholesaler say a house only needs $15K.

Replace all wiring/plumbing for critical systems such as sprinklers and smoke detectors regardless of appearance.

For this reason, if a tenant calls due to a malfunction of the smoke detectors and a technician is dispatched, you can have the following outcomes:Technician determines the smoke detectors were faulty, and replaces - owner chargeTechnician determined the smoke detectors batteries needed replacing - tenant chargeIf written into the lease that the tenant is responsible for such replacement and the detector was easily reachable, - if not or if the tenant is elderly or disabled, assume reasonable accommodation: owner charge=time/labor & tenant charge=battery costWhere the property manager must be mindful is in the allocation of the owner's resources (money).

I highly recommend that with your net worth, which is continuing to grow with these properties (while also expanding your liability - Carbon Monoxide kills one person because your C02 detector didn't have battery back up or had died, and you lose everything).  

I'm just going through the motions, not really committed to buying.

We file a motion to disburse the deposit to our clients in situations like this, so that might need to be done.Hope this helps.Best,Dave

In addition to that here are some links that you can explore to start getting a feel of what kind of free/public information resources are out there that you can use.Here is a link to the Oklahoma County sheriff's sales which the link to the list of properties for sale.https://www.oklahomacounty.org/sheriff/sheriffsales/ There are lots of steps to foreclosure proceedings (...sheriff's sale, file motion to confirm, notice of hearing, then at the hearing their is an order confirming sale, and ultimately a sheriff's deed is issued). 

So be prepared.My first purchase was a 6-plex with 5 month-month tenants, my wife and I moved into the 6th vacant unit.Unit 1- transitioned to a lease, they stayed 3 yearsUnit 2- immediately gave notice because I knew they owed months of rent to the previous LL, they moved out, no hassleUnit 3- stayed for a few months, then moved out in the middle of the night....Unit 4- got lease, moved after 4 years for work. great tenantUnit 5- moved after a year to buy a house, great tenants.It can be a box of chocolates man...I haven't done a many deals, but it seems that 90% of the time it won't be a "text book" transition, everything is in motion, I suppose that's what make it interesting..

When you are there to get the application signed or picked up a casual, "Oh since I'm here why not do the regular smoke detector check?"