1. under rent act, if original tenant dies, then there are 2 types of persons who would become entitled to tenancy rights:
i. the family members of original tenant who were living with the tenant at the time of his demise in the tenanted premises OR
ii. if there are no such family members then the legal heirs of original tenant
2. your mother was original tenant of the premises
3. at the time of her demise only you were residing with her in the premises as a family member
4. therefore you will get preference over other legal heirs of your mother i.e. your brother who is living abroad
5. so under the definition of tenant as given in the rent act, only you are entitled to tenancy rights of the premises and the rent receipt should be transferred to your sole name
6. however the landlord in order to protect himself from any dispute that may be raised by any legal heir of original tenant, would require you to submit the NOC of your brother in order to transfer rent receipt in your name
7. also when you go to sell this pagadi flat, the buyer would also require NOC from your brother
8. so even though under the rent act, you alone are entitled to tenancy right of the premises; for the purpose of transferring the rent bill to your name and for purpose of selling the flat, the NOC of your brother will be required for protection of both the landlord and the buyer
9. if your brother is in good terms with you then he can give his NOC affidavit in your favour
10. if your relations with your brother are not cordial then unfortunately you will have to file a declaratory suit in the Small causes court at Mumbai to declare you as tenant of the suit premises
11. in this suit you will have to make your brother and any other legal heir left by your mother as well as the landlord as party defendants
12. such suits take several years to resolve and given your age I doubt you would even survive to witness the final outcome of this suit
13. so my advise to you would be to obtain NOC affidavit from your brother and if he is not willing to give such NOC then offer him some compensation for giving NOC
Coming to your queries:
Registration:
the onus of registering the tenancy agreement is on the landlord and not on the tenant.
Stamp duty:
you can put whatever agreement value you wish and as agreed between you and your buyer in the tenancy agreement. The stamp duty payable on such agreement will be 5% of agreement value or market value as per ready reckoner, whichever is higher
This is not an ownership property. So it is not necesary to mention the circle rate in tenancy agreement. You can even state a value lower than circle rate in tenancy agreement but stamp duty will be payable on the circle rate only if its higher than agreement value
Flat area:
The flat area can be obtained from the BMC inspection extract and stated in the agreement
The area can also be found in the Annexure A of BMC which was given to all owners of buildings alongwith demand notice to pay property tax as per new capital value system
Different circle rate:
For purpose of computing stamp duty, there are no separate rates given for ownership and pagadi flats. The computation and rates for both are the same