I also need to be able to justify the pricing difference between this unit and the other units in case someone questions it, so I don't want to be unreasonable and ask for $900.

If the $417 includes your mortgage, then I can only calculate COC, and I'm getting 54.7% - which is still unreasonably high.

I don't have the exact language in front of me, but the statute defines the "material defect" as a problem that would cause: (1) a significant adverse impact on the value of the property; or (2) an unreasonable risk to people that live on the property. 

@Michael Lewis - Depends on the windows. 10K is one the higher end but it's not unreasonable for certain brands.

In my opinion, not a chance, completely unreasonable.

I talked to them and it was an Asian buyer that doesn't understand English well and is being unreasonable about the a 30yr roof (that is currently 10yrs old.) 

Because I also stood firm with the agent when the seller started waffling and came back within unreasonable "well I think I want to rent it now and I need to talk to my daughter".

Invest with the right partner...the property is secondary.40% (or more) is not unreasonable compared to foreclosure.Something is off here.  

If the original lease allowed subleasing you can't unreasonably deny the original tenant the opportunity to sublease to a qualified candidate as a one to one replacement of a departing tenant.

All in all, sounds like your tenant is being unreasonable.