A lift that keeps breaking down, a fire-safety report with open items and the question of a barrier-free entrance do not belong in the same box when they concern an apartment building. The three subjects touch each other technically but follow different legal tracks. Anyone who treats them jointly under the label of modernisation risks misjudging cost responsibility, tenant tolerance duties, purchase price and financing.
This article sorts the three areas along the Austrian Tenancy Act, the MRG, and the familiar tools of public building law. It shows when a measure is a statutory maintenance duty, when it counts as a useful improvement, when a specific public-law order carries the day and which of these choices must become visible in the data room, the construction schedule and the sale agreement.