numbers 14 and 16). Buildings with multiple entrances may have a single number for the entire building or a separate number for each entrance. Where plots are not built upon gaps may be left in the numbering scheme or marked on maps for the plots. If buildings are added to a stretch of old street the following may be used rather than a long series of suffixes to the existing numbers: a new name for a new estate/block along the street (e.g. 1–100 Waterloo Place/Platz, Sud St..); a new road name inserted along the course of a street either with or without mention of the parent street; unused numbers above the highest house number may be used (although rarely as this introduces confusing discontinuity), or the upper remainder of the street is renumbered. Other local numbering schemes are also in use for administrative or historic reasons, including clockwise and anti-clockwise numbering, district-based numbering, distance-based numbering, and double numbering. Finland The Finnish numbering system incorporates solutions to the problems which arose with mass urbanization and increase in building density. Addresses always are formatted as street name followed by street address number. With new, infill building, new addresses are created by adding letters representing the new ground level access point within the old street address, and if there are more apartments than ground level access points, a number added for the apartment number within the new development. The original street numbering system followed the pattern of odd numbers on one side and even numbers on the other side of the street, with lower numbers towards the center of town and higher numbers further away from the center. The infill numbering system avoids renumbering the entire street when developments are modified. For example, Mannerheimintie 5 (a large mansion house on a large city plot) was demolished and replaced with 4 new buildings each with 2 stairwells all accessible from Mannerheimintie. The 8 new access stairwells are labelled A B C D E F G and H (each with the letter visible above the stairwell). Each stairwell has 4 apartments on 5 floors, so the new development has 160 new addresses in all running from Mannerheimintie 5 A 1 through to Mannerheimintie 5 H 160. The opposite example is where old, narrow buildings have been combined; Iso Roobertinkatu 36, 38 and 40 were demolished in the 1920s and the new building has the address