As a member of my towns land use planning board I see a large number of unfortunate residents either paying penalties for building without permits or applying for variances for "improvements" they want to build.  I bring this up because  as real eststate professionals we could save our clients both money and aggrivation if we asked the dreaded "did you get a permit for that basement addition" question? In South Jersey most towns have a C of O inspection but each varies in complexity and thoroughness, some simply require the real estate agent to verify that there are smoke detectors and fire extinguishers present!

Over the years I have seen a number of homeowners spend thousands of dollars in lawyers fees and fines simply because they unknowingly purchased a home  that the previous homeowner improved without a permit or professional help. Later on when the new homeowner wants to add a deck or build a pool they get hit with the fines. 

Another issue thats been coming up lately is deed restrictions.  I know it tedious but they must be reviewed by  the client's attorney (or the client).   We currently have a situation in our town where the developer worked a deal with the DEP to enlarge wetland buffer areas in the development in order to gain approvals for additional buildable lots.  Net result, homes with small or unuseable back yards!  This one would have landed the developer, the agent, the surveyor and the DEP in court except this addendum was buried in the deed. 

I'm not saying we should play lawyer or land planner professional but a short call to the zoning  and building officials could make you look like and expert!  imagine the good will and referral power generated by protecting you clients against future potential legal issues.  After all,  If you can get the seller to address the offense you will be a hero in your clients eyes and I won't have to see them beg for a variance.