Vastu is pure, ideal and only one in Vedic Granthas. It's name doesn't have any prefix or suffix.
Vastu changes with the pace of time (even if any Property is registered for a long time in the name of same person), time to time changes in the surroundings of any Property, making sub- divisions of any Property and even when the name of registered person of any Property gets changed.
Vastu and Horoscope of the registered / rented person of the Property both are co related to one another. Vastu has beneficial or maleficial or both effects on the persons registered for any Property and also, on the persons residing / using the Property not immediately; but after a certain time period depending upon the strength or weakness of the Planets / Signs / Constellations placed in the Horoscope of the registered / residing persons / users of any Property.