This is the 5523rd most frequent Catalan word.
cuatrecasas
"Cuatrecasas" is not a standard Catalan word; it is a surname.
The word 'Cuatrecasas' in this sentence is used as a proper noun, referring to the specific name of the law firm.
El bufet d'advocats Cuatrecasas té fama internacional.
The law firm Cuatrecasas has international fame.
Here 'Cuatrecasas' is again the proper noun to indicate the location or entity where experts are employed.
En Cuatrecasas, treballen experts en dret corporatiu.
At Cuatrecasas, experts in corporate law work.
'Cuatrecasas' in this instance functions as the name of the entity providing sponsorship for the event.