So low I would be very suspect.

I suspect that you are quite right that one could get a good crowd especially in Shanghai.

I would narrow your search to the top few suspects and call, ask lots of questions about pricing, processes for each type of transaction and you'll get a good feel of how organized and helpful they are.  

However, you won't likely be re-selling anytime soon if you do purchase and fail to get the heirship issues addressed prior to purchase.I suspect, there may be more than 2 heirs (marriages, children, etc. all come into play for each heir) but you'll need to speak to legal counsel to determine if the risk is worth the reward.

I suspect you are saying that you want all of your tenants to make their payments online.No I would not require this.

I have heard of people raising rents a set percentage annually (3 or 5 percent eg) but I prefer to look at the actual market (because your tenants will also be looking at comparable units, so you want to be competitive)....and just being in rentals over a decade, I can say the small market increases add up over time....also, I self manage but I suspect you could discuss market rents with your manager and possible increases.

I suspect you will burn through agents quite rapidly.I have owned two brokerages here in PDX market so I have seen the I can buy everything investor come through the doors many times.. 

I don't have enough of the details, if you're the borrower or lender, but I suspect you're taking more risk than you might realize closing your own deals. 

  - anything suspect about this property? 

As a non-lawyer that likes to guess the outcomes, I suspect it is indeed an amended contract that has not been accepted.