If you jointly receive an income from a property or properties
Only if your element of the income is £10,000 or more will you have to enrol
in MTD for ITSA.

If you are married and jointly receive an income from a property or properties
The income is allocated to you on a 50/50 basis unless you have informed
HMRC otherwise.

If you own the property or properties with other individuals
You can allocate the income as you wish between yourselves.

If you have both property and self-employment income
Suppose your property income is below £10,000 and you have self-employment
income (excluding any income from employment paid through
payroll attracting PAYE and NI), which takes your overall income to £10,000
or more when added to your property income then you will have to enrol in
MTD for ITSA for each self-employment income and property income

Non-resident landlords
Only if your element of the income is £10,000 or more will you have to enrol in MTD for ITSA.

If a limited company owns the property or properties
MTD for ITSA will not apply.

Furnished holiday lets
Included in MTD for ITSA, where the income is £10,000 or over, subject to the examples above.

Other clarifications
Flats, apartments and commercial are classified as properties. No distinction is made for the type of property.
No distinction is made whether the property is furnished or unfurnished.

If a property is sold or disposed of
This is a Capital Gains Tax liability and not treated as income for MTD for ITSA.

If you have multiple properties
The £10,000 limit is for income from all properties and is not against each property.

Tenancy repair deposits
They are considered income but can be offset in the detail of the expenses by any repair costs.