Hopefully the delays you are experiencing are only temporary.Your local housing authority might have a similar email address or hotline for you to look into on their site.All the best!

One time I had an offer accepted in writing and later in the day received an email asking for "highest and best because there are multiple offers" from the agent's email account that he had linked to the listing website (not the email address that I had been conversing with him on). 

The Berkeley GIS website lists 3 addresses at the property.

Should I have to show my drivers license to view an off market property’s address?

Unfortunately none of the guidance issued to date addresses market risk which is where you find yourself. 

Understand Dodd Frank when applying credits and lease options; Lease purchase agreements can be a way for sellers to find a buyer, acquiring both a buyer commitment for the future as well as rental income now, to defray monthly obligations; A seller's offer of lease purchase can also attract a buyer who wants the property but needs a little additional time to complete loan qualification and does not want to or cannot make an immediate down payment; terms of payment in a lease purchase should conform to local rental data for comparable homes; the amount paid monthly to be set aside for down payment of closing costs should be in excess of the going rental rate; if not, the lender arranging the mortgage at lease end may not accept the set aside funds; instead, the lender will disqualify the funds by declaring them a "gift" from the seller to the buyer; lease purchase documents should be drawn up with legal counsel to address eventualities such as the buyer not qualifying to purchase at lease end or a market value decline impacting the agreed purchase price and lender's terms. 8.Selling to Relatives - Selling to relatives can be a good option if the seller is having trouble moving the property or if they desire to keep the property in the family; if the property is owned outright, there are few challenges, but if a conventional loan is needed to complete the deal, it can get tricky; creating conditions where a lender is convinced that this is an "arm's length transaction" may be challenging.

How accurate is the mobile numbers and email addresses?

I signed many documents online about credit card opening inquiries and verify that my home address is accurate. 

One of the items it addresses are "time sensitvie" exchanges including 1031 exchanges. 

@Marshall Shen, looking at your post, some questions:The house you are looking at (based on the address in your post) is in a great area for rentals; however, there are no two unit houses that sell for close to $715K in that area of Urbana.