The legal distinction between Mussoorie and Landour did not arise until the 1860s, when after the historic events of 1857 cantonments were properly surveyed and formalized. In particular, control of the ridge-lines and water sources was crucial, given rising British anxieties over their grip on India. The defensibility of garrisons was critical, especially in hill stations with large European populations. The Cantonments Act of 1924 further clarified the rights of the property owners; new construction of any kind, especially of private homes, was virtually banned. Conservation was also a key goal, given the excesses of the 19th century (see below); the Act clearly states that title to all trees remains with the army, hence there has been no logging in Landour since in over a century, as can be seen. By definition, all non-military and non-governmental buildings built after 1924 are 'illegal'. Therefore, there are few 'modern' homes in Landour, though renovations and reconstruction of pre-existing houses are permitted. Thanks to the 1924 Act, Landour Cantonment is—unlike Landour Bazaar—largely free of the crass commercialization that has scarred much of Mussoorie proper, especially along the 'main drag' of Mall Road where budget tourists throng in the summer. (Proximity to Delhi, Chandigarh and Ambala is both a blessing and a curse).