Is there a formula or template for structuring lease options?

[Joseph Duenas]

Hello. I'd like to try purchasing a rental unit using a lease option.  Does anyone have a good formula/ template that they start with?  For example:

1. How much do you generally put down? 

2. How long does a typical lease option run for (i.e. 3 years)? 

3. Is there anything else I should put in the contract? 

While I understand that each lease option contract will vary depending on the seller, I was hoping someone might have a good formula for what to offer initially to the seller. Thanks.