Laurel

I am self employed and work from home. I am the owner of my flat, which is in a tenement building of 6 flats. I have to pay 2 o 3 invoices each year from the building management company, which include their management fee, cleaning of the stairs, general maintenance and repairs of the building. I am not sure if I can claim a percentage of those invoices as allowable expense. Any help would be appreciated.