You may want to consult with a professional home inspector or a structural engineer and bring them to the property. They will be able to best answer the questions that you asked. It would probably be worth the cost of their services and give you some peace of mind before you purchase.
Please let me know if you have any additional questions.
All the best in your home search,
Walter J. Burns
1 Newark St.
Hoboken, NJ 07030
201-653-8488 Ext: 230