As an employee of the United States Postal Service, Autumn Dunbar's murder would make the investigation of her murder a federal case, but it would not fall under the jurisdiction of the FBI. Crimes committed by and against postal employees are investigated by the United States Postal Inspection Service (USPIS), which is the law enforcement division of the US Postal Service. USPIS's jurisdiction is defined as "crimes that may adversely affect or fraudulently use the U.S. Mail, the postal system or postal employees."
A building with the view of Morland Holmes safe house does not exist.