To fix the problem you will have copy the correct house file for the problem lot from the template house file. The path: C:Program FilesMaxisThe SimsTemplateUserDataHouses. Copy the file for the lot number you have a problem with, for example 3 Sim Lane would be house03.iff. Paste the file into the correct userdata folder. You will need to know the number of the neighborhood the house is in. C:Program FilesMaxisThe SimsUserData##Houses is the path. Replace ## with the neighborhood number. Beware that by doing this, you will be replacing the house that exists on that lot.