Is it reasonable to require to have a lot of cash in order to see a condo in an adult community 55+ for sale?

My parents are interested in purchasing a condo in an adult community 55 and older in Florida. The agent told them that they need to have enough cash to pay for it in full in order for them to see the property. That sounds strange to me, as I thought as long as one could get the money somewhere such as bank loan, that would be sufficient. Does anyone know if there is such requirement in some places or certain situations?

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