If you believe that then you would need to add clauses that also require laundry to be done within X time period, garbage bags to be swapped out every X time period, etc.

Do we set a % for the Broker for a set period of time? 

Do you do periodic inspections?

The only contingency you need to use is a 10 day inspection period.

You can state that the initial lease period is _____________ and converts to a a month-to-month tenancy thereafter.

Your job is harder due to the need to displace your landlord, unless you are willing to leave her in place as a renter for a set period of time. anything is negotiable!

Let's say there is a 10 day redemption period (just for a talking point).

I would consider waiting out the 20 day First Look period but there are already multiple offers and they are calling for highest and best on Monday after the initial 48 hour list period. 

Option period just expired with the inspection popping one major problem with the HVAC that seller is fixing.

To answer your question -  ultimately I see my self purchasing about 15-20 units (assuming my cash flow requirements are met for each unit), over an 8-10 year period (starting next year)  in combinations of mostly SFRs and Duplexes (with consideration for triplexes and 4-units).