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numberOfBedrooms

A Schema.org Property

This term is proposed for full integration into Schema.org, pending implementation feedback and adoption from applications and websites.
The total integer number of bedrooms in a some Accommodation, ApartmentComplex or FloorPlan.
Values expected to be one of these types
Number
QuantitativeValue
Used on these types
Accommodation
ApartmentComplex
FloorPlan

Source

https://github.com/schemaorg/schemaorg/issues/2373