If anything was left by the tenant and later found, it shall be stored and/or disposed of by the landlord as per law.Security Deposit: As per agreement and as required by law (RCW 59.18.280) within twenty-one (21) days after the termination of the rental agreement and vacation of the premises or the landlord’s learning that the property has been abandoned, the landlord shall mail to the tenant’s last known address a full and specific statement of the basis for retaining any of the deposit together with the payment of the refund due the tenant under the terms and conditions of the rental agreement.

@Mindy Jensen where's my virtual cork-board ;-) ), but here are some alternatives to get you started:Douglas Gray's "The Canadian Landlord's Guide" is a good starting volume.Steve Cohen and George Dube's "Legal, Tax and Accounting Strategies for the Canadian Real Estate Investor" is a must-have overview of how you buy, own, and dispose of your real estate and the implications of different strategies.    

Grouping activity should be evaluated and done carefully as you cannot release suspended loss by disposing just one house.This is complicated part of the code and you should sit down with your professional. 

We will clean entire property of trash and debris from our construction renovations and dispose of in thedumpsters provided.

So basically it doesnt cost them anything and you dispose of their problem?

I had to cops at the house twice to collect drugs I find hidden in walls and rafters and disposed of a ton of needles.

@Naomi YamasakiHi Naomi,I looked at properties in Long Beach, Wa a few years ago and my main concern was the cost  of sewage disposal for unserviced lots.  

They will dispose of them

I am looking for input on my analysis, critique of my numbers, and tips on how I might better analyze in the future.I used Rentometer to find similar rents in the area, Realtor.com to find the property, and the city website to find garbage disposal costs.

The money they are giving you are saved only because they didn't pay rent for the last 6 months, sold all appliances, water heater, garbage disposer and the toilet bawl, didn't pay their utility bills for a big portion of their stay and managed to squeeze additional $2,000.00 as cash-for-keys from their last landlord.