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The article studies the dependence of the human flow density on two main parameters: the width of the staircase and the number of people on the floor. It was established that violation of standards in terms of the entrance door width and the presence of a stair hall have a strong influence on the total time of evacuation due to the formation of clusters. The tabular dependence of the maximum human flow density on the staircase width on the number of people per floor was obtained. On the basis of this dependence, the graph was built, which can be used in the stair width design, taking into account the allowable human flows density in the case of known average number of people on each floor of the building.

The paper analyzes the waste recovery methods. The comparison of the recovery and processing technologies of solid domestic waste is made. The most effective technologies are proposed from the point of view of ecology, specific capital investments, profitability. Analysis of the research results showed that the pyrolysis technology for the neutralization and recovery of domestic waste is the best according to technical and economic and environmental indicators. The calculation of the economic pay-back is carried out using the example of the waste recovery plant construction by the pyrolysis method in the Arkhangelsk region. The calculation took into account all costs associated with the construction and operation of the plant, including capital investments, maintenance and removal of waste, as well as their storage. At the same time, the item of income was formed both at the expense of obligatory of the Arkhangelsk region resident payments for the domestic waste removal, and at the expense of additional financial revenues from electricity and secondary resources (slag, pyrolysis oil, pyro-gas) generated during the recovery process. The project payback period was 7.8 years.

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This article is devoted to changing the functional purpose of the object in an emergency condition and included in the "gray belt" of Saint Petersburg. The analysis of the physical and social environment of the study area was carried out. By results of the study, a SWOT analysis was compiled, and the option of the functional change for co-living was considered. The purpose of co-living is to create a home environment that inspires and empowers its residents to be active creators and participants in the world around them. The necessary investments and the payback period of this project were calculated, the business model was developed.