May, If I understand when you say seller, I assume you mean seller of a condo you are buying. It's really neither good nor bad. Maybe he/she is trying to be helpful; maybe the attorney already knows the building, maybe, maybe, maybe. If you hire him/her, they would work for you. That said, if you have a hesitation, it's always best to follow your instincts. I suspect you are going to want to work with someone you feel completely comfortable with particularly if you are a first time buyer.
Best of luck. It's exciting buying a piece of property.
Jessie Cuddy, Realtor
Boston Bayside Properties
2253a Dorchester Avenue
Dorchester, MA 02124