Put some carpet over them .Done 

We ripped up carpet & installed clearance laminate. 

Before heading back out of town (I lived in Los Angeles at the time) I bought a gallon jug of bug killer spray from Lowes that stated it killed bedbugs and sprayed the heck out of the two vacant apartments and the carpeted hallways as well. 

I stay away from the property so do not have access physically.1> How do I investigate and find out if it was tenant fault they clogged the toilet or a natural cause.2> What is approx. cost to clean the lines and clean the carpets?

Basically I need to account for all the smaller items (sink, washer, dryer, carpet) even if those items were fully depreciated years ago?

More durable, still fairly inexpensive, and again isn't dramatically more expensive than mid grade carpet, which will need professionally cleaned and replaced much more frequently.

It'll probably need some painting, replacement of the carpet, and cupboards. 

If you’re lucky it’s just a carpet replacement.

The tenant should have sent a certified notice of the damage (water entering the unit) as well as notifying the landlord that water was soaking into the floor, wall, carpet, etc. before there was mold. 

It's nicer inside that others comparable in rent here, nicer carpet/windows/paint vs. the standard plain white walled rentals and cheap carpet.