In last one year whether any sales of flat have taken place ? 

The consideration mentioned in sale deed would help you in determining market price of your flat 

You can appoint an government approved valuer to determine the selling price based on that you can sale the flat though if that is below government rates the stamp duty by buyer has to be paid on government rates. 

You are being fooled. Registrar office District Level Committee rate is far lower than market price. Don`t even rely to it. With time, value of property increases immensely, IT may be old structure which can be renovated, value of property must be 5000times of value of 45years. 

Find out local broker, do some exercise to ascertain recent market price in area. Rate of flat shall be far heigher than your expectations.

1. The seeing rice is determined by the parties in which market price of similar property in the neighborhood does play a role.

2. The registration office also has its own mechanism to fix the market price of a property for the purpose of collection of stamp duty and registration office. The registration office has nothing to do with the price at which the parties are settling the deal.

3. So forget the version of people and after talking to people well aware of the real estate sector fix a price for selling 

you can visit a government approved property valuator and seek help to get the correct financial overview of the property.

This is my response to you:

1. Approach the office of the sub-registrar;

2. The ready reckoner rate will be obtained from there;

3. Once that is obtained then your grandmother can sell it likewise;

4. The buyer has to pay stamp duty on the same ready reackoner rate;

5. Consult a local lawyer and take steps.

As a seller, your maternal grandmother is entitled to get the highest market value of her property irrespective of the age of the property. To know more about the correct market price of an immovable property you can visit the website of Directorate of Registration and Stamp Revenue (https://wbregistration.gov.in/(S(thdc12w5e1vesmn3f2dlq5c5))/index.aspx). Because the stamp duty and registration fees are determined from the market value of the property from the registration office. However, where a buyer is applying for a home loan, the bank has their own valuer who visits the property to determine its value as they will sanction the loan based on their valuer's report. It's on the buyers' to arrange the funds to buy the property. Better look for another buyer who is willing to buy based on the market value of the property evaluated by the office of Directorate of Registration and Stamp Revenue

The registry value is ready reckoner value which is always less. Market value is more.  Inquire the same area the said place from broker. 

A very old building or flat may not have a very good sale price or value while selling, the price is for the land alone, i.e., since it is flat system, the value will be for the UDS only. The structure may not fetch the desired value. 

You can enquire a real estate broker or office about the rates and the meaning of the technical concepts which do not make you understand in a plain language.

Dear Client 

you should send some of your friend to the property dealer of your area and tell the dealer that we want to purchase a flat in this area and what is current market price and also ask dealer to show some flats in the area by this process you can easily find out current market price of your flat.