Not sure how you plan on purchasing this property but for the sake of this exercise Ill assume you are going the standard route with 20% down.

The lesson learned ... 1 - It's good to know your lease clauses inside and out and not need to exercise your authority.2 - Use spouse as a "higher authority" figure to buffer conflicts with women tenants.3 - Draw on the collective wisdom of my BP family to vet responses to difficult situations.

Can the tenant-buyer upon exercise of his option ask the bank for a loan remodification since he is the principal homeowne now?

The exercise will verse you so you can rebut any ney sayer later.Understand the inability to finance can be doing you a favor.

If Bruce Norris is correct and the prices will go up 20%/year in next 2 years (I assumed that the property is in Riverside), then you may be lucky and make some good money.Maybe a lease option would be better, if the price goes up you exercise the option, if it goes down you lose the deposit?

A few years from now you will try to exercise this option.

Sorry, but I'm a little dubious of this "I'll bring money to the closing table when they exercise the option" strategy.

How can I verify if the option is legitimate and exercisable?

These properties are typically occupied by white collar workers and have amenities such as garages, in-unit washer/dryers, pools, spas, exercise gyms, the latest technology, etc.

If the lender calls the loan or the seller for whatever reason refuses to allow you to exercise the option then you will be unable to sell if your tenant/buyer wants to exercise their option.