Don't think there's anything wrong with the way Jan used the term "property", as in "
a property".
See e.g. Oxforddictionaries.com:
"property
A building or buildings and the land belonging to it or them:
he’s expanding now, buying property
[COUNT NOUN]: the renovation of council properties
synonyms:
building(s), premises, house(s), land, estates, acres, acreage;
freehold, leasehold;"
and:
"The only scenario of both
a residential and commercial property where a semi-commercial mortgage would not apply is when the residential and commercial aspects of the space have separate entrances – for example, a property where the residential portion can be accessed without having to go through the commercial or retail portion." (
http://www.jubilee2000uk.org/analysis/commercial-mortgages/s... )
"Full description
A RESIDENTIAL AND COMMERCIAL PROPERTY PROMINENTLY POSITIONED ON THE BUSY SOUTH ROAD AT WALKLEY. THE GROUND FLOOR PREMISES IS A SINGLE SHOP. THE FURTHER TWO FLOORS ARE RESIDENTIAL, HAVING A RECENTLY REFURBISHED ONE BEDROOM FLAT WITH GAS CENTRAL HEATING AND DOUBLE GLAZING." (
http://www.rightmove.co.uk/commercial-property-for-sale/prop... )