Seller wants cash only but closing day is 4 more than 4 months aw

[Oren Yehezkely]

Hello,

I am considering purchasing a condo in Miami. The condo is rented but is offered for sale now (cash only).

The closing will not be before the end of the lease which is in September.

First, I am not clear why the seller wants to sell it now so far ahead of the closing date. Any ideas about his strategy?
Second, he is asking for a 20% down. Would you do that?

Thanks for your input.