A press release is an announcement written in a news style.
Look for and learn the Associated press' "Five Ws" News style of: Who, What, Where, When and Why.
Then use your creativity to write your press release using that style.
If you are really good you can get all five Ws into the first sentence e.g. "John Smith, (who) President of Miami's (where) Action Agency (what) announced today (when) the opening of their new branch (what) on Biscayne Boulevard" (where).
This is news. It may not be earth shattering news, certainly not front page news, but if you are the business editor and it is a slow news day, this release will get ink.
Your second sentence should be a direct quote from the "who" person in the first sentence. "Mr Smith said, "Our agency opened the branch on Biscayne Blvd because it is a main thoroughfare in the city".
In the AP news style, stories are written like a pyramid. The tight essentials are at the top of the story. As the story progresses, more and more, not so important deails, that broaden the story are shown.
News is what is NEW. So twist your press release so that what you are ANNOUNCING is really something new.
Using the technique I just gave you, I have had countless stories in national as well as local print and broadcast media. It is the classic example of the style that a good press release should have.