Ann: Revised 2019 earnings guidance, page-34

what then, easy, Quote "Ideally, the average lifespan of any concrete structure is 75-100 years. But, it is considered that the average life of an apartment is 50-60 years while of a house it is 40 years." any high rise building built prior to 1960 may need to be replaced, any houses built just prior to 1980s, due to conrete cancer, dated looks and functionality or even not efficient use of the building footing areas. And this would be an ongoing process.