Domestic and commercial security are in most ways very different fields, however if you think about the number of flats and communal type living spaces that now exist, there is certainly a crossover between the two. If you want to have a security presence in places like this, that is completely understandable, as there will usually be a large number of people and any kinds of incidents could occur.
If you choose to hire a security guard for a large domestic space, this now isn’t at all unusual. It is still not especially common for people to have private domestic security guards, though this can happen in places like gated communities and more exclusive residences. If you do move towards hiring a security presence as a block manager, a commercial security guard might be the right person for the job. They will have worked in large, busy organisations and will be able to offer an excellent security service.