I have a lease coming up due and the lease agreement has 2 people (not related to one another) on the lease with an initial security deposit of $1000.

Comb through your purchase agreement. 

. :-) I am wanting to get a CMA on the property without the pressure of a local realtor trying to make me sign a listing agreement before I’m ready.

This is even though the California Purchase Agreement has a liquidated damages clause that states if the buyer defaults the seller “shall retain the deposit”.

I have a few tenants who hand me checks for their rent and they tell me their will be no money in the accounts for 15+ days like they are entitled to pay their rent this way.So, last month, I sent a letter to several tenants telling them that they will be obligated to pay a late charge if their rents are one minute late and I told them to read their lease agreement in regards to their receiving a 3-Day Notice To Pay or Quit and our eviction process that starts when they have not paid their rent within the last date stated on the 3-Day Notice.I strongly believe that I have to whip my tenants back into shape (whatever that means).

@Lisa James If your plan is to find a single buyer to step into your shoes, there is no contingency necessary (for this particuar issue) -- single purchase agreement, freely assignable, covering both parcels.

You can serve them a notice of violation of the lease agreement.

Last, can I add that agreement in the purchase contract or does that have to be a separate promissory note? 

. - owner performing significant renovations- tenant breaking lease agreements- owner moving in - owner taking property off market for more than a year

If you want to contribute to the down payment in exchange for a percentage of the profits/cash flow, you can draw up an agreement outside of the purchase contract (see a lawyer for help).