Hi Nimal,
Carer's Allowance is not means tested.
This means that it is not affected by your income or savings, although there is an earnings limit.
If you get Carer’s Allowance, you are allowed to work but must not earn more than £151 a week after tax, National Insurance contributions and half of any pension contributions you make have been taken into account.
For more information, please have a look here:
Carer's Allowance
Your income from property in not considered work and should not affect your Carer's Allowance, however, you will need to declare the income from property in a Self Assessment tax return.
Thank you.