They seem legit insofar as everything seems legal and kosher.  

Go as high as you can go legally. 4.

In any contract you don't typically need a clause saying what you CAN do, its assumed you can do anything legally allowed as an owner including sell.

You can buy my book, the book from Brandon in the BP bookstore, or Every Landlord's Legal Guide by NOLO. 

In that case, you’d typically need to file a legal challenge, which could involve going to court and showing that the restriction is unnecessary or unreasonable.The best advice I can give would be to consult a real estate attorney to understand your specific situation and options.

I am not sure of the legality associated with this and the issues of going from 4 units(residential) to 5 units (commercial) even if one unit will only be owner occupied.

Honestly, I would not sign any lease until you positively close and legally own the property.

If you need financial help, ask under the "Finance, Tax, and Legal" forum.

I would NEVER Ever use OBIE INSURANCE  --Not honest in their dealings and do not expect refunds on cancellations  I am of the opinion that they are legal scammers Just be careful

On June 7th, we sent an itemized list of deductions via text; he responded on June 8th, disagreeing and threatening legal action.