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Thank you for clarifying your need. It helps to state it at the outset. Here is my suggestion:

We, the office of XXX, Attorney at Law, where we practice Court of Cassation and the High Constitutional Court cases, as well as some real estate brokerage, hereby acknowledge . . .

The trick is to introduce the relative pronoun "where" in reference to the office; to use the verb "to practice," which is the term used by such professionals as lawyers, physicians, etc; and to introduce the word "cases" as the main noun (which turns the phrase "Court of Cassation and the High Constitutional Court" into a modifier). The rest follows naturally.

This is just one way to handle this sentence. I am sure there are other equally good approaches.

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Note added at 1 day5 hrs (2006-01-26 11:24:02 GMT)
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Re-reading my suggestion for the whole sentence, I see that I have mindlessly copied and pasted without proper editing. The definite article preceding "High Constitutional Court" should be delteted. The sentence should read:

We, the office of XXX, Attorney at Law, where we practice Court of Cassation and High Constitutional Court cases, as well as some real estate brokerage, hereby acknowledge . . .

I apologize for the haste.