You are going to want to re-key the front door and the room door every time a tenant moves because who knows how many copies of you house key they made for extras for friends ETC.

For the foreclosure exit you would also want to account for basic preservation costs such as re-key and lock box, and interior inspection and valuation. 

You can have it rekeyed to match the existing one, or make sure your tenants get keys before you change it.2.

I have my local hardware rekey locks and they charge $5 for that and about $2 per key.I change common door locks and unit locks every time I change a tenant, and I get new locks or have them rekeyed to a different key that I have never used before, just in case one tenant someday happens to try a lock with an old key...

Can I remove (and then reinstall) the board myself and use a locksmith to get into the doors?

Its tough, but try to build a network with other contractors, you should know the approximate cost (incl labor) to fix a leak, broken shower, caulking the bathrooms, rekeying your locks etc.

When the officer and locksmith came down at 1030 am they were informed by court that my tenant filed for a stay and dropped in mailbox after court was closed Mon nite.

They put a tenant in a property (I pay 65%of first months lease), tenant pulls apart all the appliances looking for copper or parts to sell (I pay $1500 for new appliances), they evict tenant and I pay minimal fee while it’s empty until rented, they rent to new tenant (I pay 65% of new tenants first months lease and rekeying fee), etc. - over last 2 months property manager has made about $750 extra payment while I have lost about $2000 unexpected losses and it’s all a result of the property managers decisions.

If tenant refuses, you show up with a locksmith and change the locks while the tenant is away, conduct your Lead Paint test, and then start the eviction.I think most of this would be resolved with more stringent background checks and higher standards.Have you spoken to the City about this to see how you would get around it?

I already re-keyed her deadbolt lock myself free of charge.