Proof of Funds to access Financials when still at the exploration stage

I've been exploring opportunities in senior living, and have been asked for proof of funds from a potential target before I can review their financials

How, if at all, have any of you dealt with this issue when faced with this request?

I'm exploring multiple funding options (SBA, Family office etc) but have not yet pulled the trigger on pre-approval for a loan, but don't really want to provide personal financials at this stage...

Would love your perspectives!

Thanks in advance!