Please understand that Michigan requires all real estate agents not under a Buyer's Agency Agreement to work for the home seller. If the seller is asking the price above, that's what the home is worth. Now, your Buyer's Agent may have a different opinion and provide information to you that cannot be shared with the seller about recent sales of similar homes.
For this reason, I suggest interviewing 3 or more agents and ask about Buyer's Agency and what services they do or do not provide.
The current SEV of any property would be available by contacting the city or township the where the property is located. Online information is from 2008 in most areas, which may not be accurate for this home.
If you need assistance with Buyer's Agents (any agent not listing the home you're considering purchasing) let me know, I will email you a few local agents. You can also look in the consumers section of http://mirealtors.com where there will be a list of all agents in the area.
Wish you luck