There are certain situation where officers/owners of the corporation can be held accountable for the obligations of the corporation, but these are typically cases of negligence or "questionable" conduct.  

It's normal for a listing broker/agent to leave the buyers inside alone with THEIR broker/agent if they want to talk freely about how they feel seeing the property.This is when having the listing broker there or the seller can be a negative.Having said that a listing broker SHOULD NOT let the buyers out of their site when inside of your property alone when they do not have a buyers broker/agent present.They also should NOT use any part of your property as an ashtray outside or in.It sounds like to me you hired the wrong person.I would be calling the head broker of the company and asked to be re-assigned a new listing agent and tell them what happened.If the principal broker cares about their company they will take the incident very seriously.If they are the head broker then ask to be released from your agreement on grounds of negligence.

Ensure that your lease provides for termination for violations of law or ordinance and for your indemnification for any loss arising from thier occupancy/lease regardless of any contributory negligence or legal liability.Parrrrrrdeee, Parrrrrdeee !

I do not agree. the repairs were not made due to negligence of the tenant so no other payment other than rent is warranted. the amount of the water bill was deducted and  as always payment will be on time."

An LLC may offer limited protection (it will never protect you from criminal or negligent acts) if you are willing to keep the required records and operate correctly.

Speaking with the tenant he said he really likes the house a lot and would want to live in the house for another year or two.Although the numbers seem to look good on paper my concern is a year down the road when this tenant leaves having to do extensive repairs due to negligence of the current tenant as well as the fact that this house was built 70 years ago.

@Steve, my NJ leases also state that any unpaid amounts that the tenant is responsible for (water/sewer, negligent damage, late fees, etc.) are considered "additional rent" and are due with the rent.

However, insurance is limited because it only protects you from one type of liability: accidents/negligence.

Haha - I've never heard of a structural warranty.I'm an engineer and have done some professional engineering in the structural field.My work is solid and non-negligent however I don't know what that even means - ie: a structural warranty.Maybe some more specific questions would help you to feel more comfy about the decision to purchase:Soil quality / hardness etc. 

An extra $10 is negligible if they don't want to move for another reason.