Non warrantable condos are always an issue, there are lenders that will finance them, at a slightly higher rate of course and usually with a larger down payment.  

I've run into deals where things keep changing and I usually bail. 400K is a sizable purchase and it seems that neither you or the seller are completely ready to make this happen smoothly in a short period of time.

Also, I usually find most unforeseen or deferred maintenance issues come up in the first 6 months of owning a new property.

Can’t promise that the contractor is immediately available, but that’s usually the sign of a good contractor, haha.

But you usually need 20% or more for a down payment.

Residential leases usually have an implied warranty of habitability, which basically means the premises must be suitable for human habitation. 

I ran into a broker before that is no fee but they don't usually take on part timers.

(Usually 15%, so $12,000) plus 25% tax on the depreciation you’ve taken over the years.

If you don't fit the guidelines they set, they won't buy the mortgage and the bank is stuck with it, which the big banks don't usually want. 

If available you submit your bid price according to the pricing guidance provided by the note seller, eg. it can be 50% of UPB but you may submit a little less than that, i usually do.