This research site uses the term ''Period Revival'' to refer to houses built in Monrovia between 1920-1950 that, excluding the Folk Victorian and Spanish Revival, are miniatures of popular architectural times during previous periods of history. Monrovia has the following Period Revivals:
English cottage: Steep roofs and walls which may be made of brick, stucco, or half timbering. Doorways and windows may be rounded. The roof line may form ''eyebrows'' over the doors and windows. This roof line is meant to simulate thatch, the original roofing material of this type of house.
Tudor: Very similar to the above, but with tall brick chimneys and the implication of more money as these houses are modeled after the medieval English townhouses. Diamond-pane, hexagonal and/or oriel windows are often exterior features. Exterior walls may be of stucco which has been applied over lath and plaster, weatherboard, shingles.
Neoclassical: See Victorian.
Colonial Revival: Symmetrical. Exterior walls may be stucco or wood. The roof dormers which, in a full-sized house, would contain windows which open into rooms, are simply decorative. The front door often has a fan design over it and is centrally placed usually with an equal number of windows on either side of the front door. The tiny porch may be extended in a rectangle shape or semi-circular attached porch. Both porches are supported with slender round or rectangular columns.