Thanks. That clears up a few things :)

I've read some buyers will negotiate the price again if they would receive all cash, after agreeing to a lease option. Maybe I was thinking of a different scenario than lease options?

@Tim Ivory, I think you mean SELLERS will negotiate, correct?  And that *may* be true, but why would a seller want to renegotiate a price when he has a price locked in that the buyer must pay IF he wants to exercise his option?  And if the buyer is bringing in his own financing, which is the usual case, why would the seller care from where the money comes? And if the buyer chooses NOT to exercise his option, the seller is free to offer the property to another buyer, possibly at a higher price.

@Tim Ivory, You are correct that with a Lease Option Sandwich, it is your job to put in a tenant that will become capable of purchasing the property. If you only put in tenants who you know will never be able to purchase the property and take a large deposit, then you will be performing an unethical practice (I'm not implying that you would...).

Once the lease option expires the contract is complete. The landlord/owner/seller is now in full control of his/her property and keeps your deposit money. It is wise to put in a clause that allows you to pay for an extra year. That way if you are running out of time, you can put another $1000 down and buy yourself another year to rent the property to a prospective buyer, or just go ahead and sell it. 

I've heard good things about @Wendy Patton. 

Chris Goff does a pretty good overview, the best I've seen so far. Here are some links:

Part 1) https://youtu.be/3Png0s4MSr8

Part 3) https://youtu.be/fX8hLwQBSAI

Good luck!

Does anyone know how and if you can involve a realtor if you're wanting to see if the owner wants a sandwich lease option? I'm about to place a call to the realtor but wanted to see how they could be part of it?

Highly unlikely that a realtor will want her client to have anything to do with a sandwich lease.  In fact, it's highly unlikely an agent would even know what a sandwich lease is.

2023 now. Does this strategy still work?(sandwich lease option)

Henrry, a sandwich lease can work today, but the devil is in the details.  The numbers in the deal matter.  Is there a sufficient reward to risk ratio for you to be comfortable?  The agreements you use, also, are a critical part of the puzzle.  If you getting started with lease options I suggest you take a look at the cooperative assignment strategy.  Much less risk and homeowners are more likely to accept your offer.