There were half a dozen regular investors there, which proceeded to bid up two or three properties to levels that were unreasonable, and they proceeded to joke around about bidding each other up after the auction.

I don't think it's unreasonable to expect something like a water-proofing job to come with some sort of a guarantee.

If they waited an unreasonable time before initiating those steps, or were otherwise negligent, they MAY be liable to some extent.

I guess you learn something unreasonable every day. 

Even if your property is not subject to rent control, housing court in the District will not take an unreasonable jump in rent too kindly.

He talked down to me, saying that my offer was unreasonable.

Unreasonably inexpensive and VERY thorough. www.evict.com.

If you are talking 10+ and there is a lot of labor involved, $5K doesn't sound unreasonable.

Buyers and sellers can become unreasonable in their demands.   

Ryan, Your numbers do not seem unreasonable.