MPDU requirements are enforced through MPDU Covenants, which are placed on the property prior to sale for a certain length of time (a ?control period?). An MPDU control period begins on the settlement date of the initial sale of the MPDU and currently lasts 30 years. If the MPDU was first purchased before April 1, 2005, the control period likely was 10 years. Different rules apply depending on the control period. A homeowner must know what those are before renting out the property, refinancing, taking out a home equity loan (HELOC), adding a spouse or adult children to the Deed, removing a spouse from the Deed due to divorce, transferring ownership through inheritance or putting the property up for sale. Once the control period has ended and Montgomery County has received its share of the excess profits, (if applicable), the County will terminate the MPDU covenants. Please refer to the link below entitled General Rules of MPDU Homeownership.