Keep in mind that towns and cities may have different ordinances that may require city approval before tackling your plans.

I was pre-approved by a lender a couple of months ago, but decide not to buy the property because the home inspection found some structural problems that I did not want to deal with. 

Does anyone on here know if it is legal for me to put a lock on the thermastat in my duplex?  

Perhaps needs to request for a letter or some type of documentation for the approval as well. 

Hey all, I am considering a 4000 sqft 2 family house with a full basement that I am looking to turn into an additional legal unit.

If it was legally yes you are obligated and they may do a due on sale on you and make you pay it off. 

Are sandwich lease options legal in Virginia?

Depends on the lender (because where the property they lent money on once was a vacant lot, it's now a thriving restaurant) and the zoning board (to determine if the property can actually be legally subdivided).I could be wrong, but that's what I'm getting from what you wroteStephanie

Preparing Articles of Incorporation is the preparation of a legal document. 

I’d love to get a few recommendations of companies that you’ve had a approve experience with.