Before doing anything , make sure ur RME is closed:
Go to your data/world folder , find the file called "map-house.xml" ("map" will be replaced by ur maps name), and open this file with notepad/wordpad or whatever... Now , do CTRL + F and enter: "Silver Street 4"
You should be taken to the line like this:
<house name="The Highers #1" houseid="1" entryx="1961" entryy="1874" entryz="7" rent="135000" townid="2" size="166"/>
except your line will have the information about that house entered.. Take a look at this part:
townid="2" -- and change it to the corresponding city.
press save , and open rme .. tell me if this helps