I need quick access to 75k-100k. What’s the best course of action?

I came across a house with some rental houses on the same property. We weren’t necessarily in the market for another home right away, but the price is hard to beat. I’m wanting to come up with a down payment for the new property but keeping my original house so we can rent that out also. From what I understand HELOC’s aren’t an immediate thing. Would a bank just loan me this money and use my home equity as collateral instead so I can get access to it quicker?

Thanks in advance