Upvote:3
The safest thing to do would be for you to leave the country and to give someone you trust limited Power of Attorney over your affairs and let them wrap things up for you. This does not have to be a lawyer -- you could ask a friend to do this for you. There are forms on the internet to give PoA. Be sure that it is limited PoA and be specific as to what you authorize them to do and the time frame in which it's done (otherwise they could do nefarious things that could ruin your credit, etc.).
Attorneys are also very cheap and used to this so you could hire a real attorney to do your final affairs as well.
Upvote:6
Assuming that you are leaving the USA in time with a valid visa and were not "removed" as they call it, you should be able to enter the USA with either passport (As long as they are both eligible for the VWP) for the purpose of tourism or doing business - not to work or study.
Selling a car, ending a lease is doing business. Visiting your friends is tourism. Just because you were denied to stay as a student or to work does not mean that you are not eligible to be a tourist or doing business in the USA.
Depending on your passports, you might raise suspicion if you go out with one and come back with another - specially if your passport is a biometric one.