Пишу Вам в связи с отправленным письмом - обращением собственника компании ко всем собственникам апартаментов комплекса "Silver beach" в сентябре месяце.
I am writing to you in connection with a letter of appeal by the owner of the company to all owners of apartments at "Silver beach" during the month of September.
I am writing to you in connection with sending a letter - a request of the owner of the company to all the owners of the apartments of the complex "Silver beach" in September.
i'm writing to you in connection with the owner of the company sent the letter to all owners of an apartment complex, "silver beach" in the month of september.