It has to be very specific(with contingencies), I’m currently having problems with my partnership as one of the partners isn’t doing his part.

Some things to include.Still pay for your own appraisal and have a appraisal contingency in the purchase agreement.

You may want to tell him you'll pay $25K Contingent on Appraisal and Inspection, JUST to see what he says.

Two things I took from this meeting: #1 is I will try to get this lot under contract with a rezoning contingency written in. #2 the owners of the other lot in question don't know that the city is considering rezoning their vacant lot, I should put in an offer before they find out their lot is going up in value by $300,000 when/if the city rezones it.

We try to make the deal contingent upon them obtaining a new c of o.

Than add some contingency for other items along the way

But the Magical options where a tiny sum of money becomes a large sum & the deal is contingent on the parties "helping each other out" will get struck down. 

The actually reno will cost around $90k and we held on to the rest as a small contingency/change order fund.

Commercial purchase agreements typically have a lot of terms to be negotiated and it's often a good idea to start out with coming to an agreement on price and basic terms such as earnest money deposit, due diligence period, cash deal, seller financing, or if there will need to be a financing contingency.

one thing I would like to mention though, @Stephen Craul is that if you want to get first pick on off market deals you can't be making offers with all kinds of inspection contingencies.