Different addresses are stated in different copies of the license. https://opensource.org/license/gpl-2-0 has: "59 Temple Place, Suite 330, Boston, MA 02111-1307 USA"

https://www.gnu.org/licenses/old-licenses/gpl-2.0.txt has no postal address.

https://spdx.org/licenses/GPL-2.0-only.html has "51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA" in red italics, and says: " Text in red is replaceable (see Matching Guidelines B.3.4). License or exception text will match to the text for the specified identifier if it includes a permitted variant of this replaceable text. The permitted variants can be found in the corresponding regular expression as shown in title text visible by hovering over the red text."

Which in turn says: "can be replaced with the pattern .{54,64}" (that is, any string between 54-64 characters long).