They would not necessarily adversely effect the property and or its value, nor would there be a need to disclose such information unless the owner / agent was aware of such and that it did affect the value.
That doesn't mean you should rely on their disclosures. Due diligence requires going to the building department to look at setbacks and make sure all permits were pulled. In addition, a home inspection is always important, as is having your own representation.
Good luck with your home search!
This ADDITIONAL requirement is intended to alert buyers they may be at a significicant disadvantage should the choose to purchase without adequate representataion.
Your question contains reference to Set-backs, easements, etc which is a requirement for the sale of all homes. If not in the disclosures,(such information is rarely in the disclosure document) they will appear most diffinately in the survey the bank will require.
Be aware, a survey can produce an aritifact of which the current owner was unaware. I've experienced a easement appearing down the middle of a home that was build in 1963, had six owners and the easement appears on my watch.
Stuff happens! It does not mean deception in the cause.
Now, Molly, you really, really, really should be turning to your real estate professional for what applies in Canton, MA. You do have one...yes?
If you can prove that there was something that they knew and didn't disclose to you, you would have a strong case regardless whether the seller is the agent or not.
That said, I always recommend my buyers to go to the City Building department to confirm status of setbacks, easements and special permits for themselves. Regardless what the seller and/or agent thinks he/she knows ... if you are eventually the owner, it is more important that you know for certain what the City has on record.