PH - actually stands for Propiedad Horizontal. However in real estate terms, it's a multi-unit dwelling, without an elevator, usually no more than 4 units, and no more than 2 stories (ground level and one above) higher. PHs originally were one single lot with various houses constructed, so technically each house did not have their own deeded land, but owned the actual constructed unit only. Construction style varies greatly and these types of dwellings are disappearing fast as large lots are very valuable for construction of apartment buildings.