buying a flat with cash

Hello,
We have lived in Gibraltar for 4 months, old town and WestOne, in the past year.  We loved the amenities, balcony, and location of WestOne.  If we have cash, what do we need to do to purchase a flat in Gibraltar?   

We are Americans and were wondering the best way to set up a bank account and if we need a solicitor? 

Thank you for any help or guidance,

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