Either the owner can pay or the buyer.

My question is: when wholesaling, after finding a great deal, do you need real proof of funds to the get the property under contact or is there a way to get it under contract, find a buyer and complete a double closing/assign the right to sell without actually having the cash for the property? 

You can't show the home to potential buyers.

Given the fact that the Baby-Boomer generation is retiring and interest rates are high (making a buyer's market) I should be in a good place.

Here’s the winning formula successful local house buyers and wholesalers use to connect with sellers, close deals, and create win-win solutions:Be Relentless: Show up every day with positivity and persistence.

The successful wholesalers are the ones that are direct with the seller and have done an analysis on the deal to show it can be a successful investment (always double check with your own)totally agree, I would add the don't act sketchy and present their available homes in a consistent/professional manner to buyers. 

Have the co-op take out a loan for 60% of building value, then charge buyers 20% of value in cash for each unit. 

I locked up my first deal , now im trying to find buyers.

Sometimes occupants still live there and eviction is not easy, and I have even heard a story once that the yakuza are involved in the construction and real estate business and exorted money from buyers through occupants in these properties. 

.•30-Year Fixed Mortgage Rate: 7.10%•15-Year Fixed Mortgage Rate: 7.35%•Fed Funds Rate: 5.25% - 5.50%•10-Year Treasury Yield: 4.45%•Housing Inventory: 632,000 active listings (33% with price reductions)With home affordability still a concern, any shift in rate expectations could have a major impact on both buyer demand and investor financing conditions.What Analysts Expect from This Week’s DataCPI Inflation Report (Tuesday, February 13)The Consumer Price Index (CPI) measures changes in the cost of goods and services, serving as a key indicator of inflation.