it is advisable to have registered POA for giving premises on lease for period of 20 years 

Yes, power of attorney is a legal document that allows one person to act for another person. POA is effective till not revoked by principal.

Notarised POA is valid and you can give premises on lease on basis of said POA 

Yes, if not yet revoked and no time limit.

Hi

Firstly, confirm whether the parties to the said POA are still alive.  

If they are alive, then confirm that the same is valid and subsisting even today.

If the said requirement is complied, you can go ahead.

Good Luck. 

The actual owner's name will be mentioned as you are just the Power of attorney holder and if the document has stated that you can enter into rent agreement on behalf of the owner only then you can. A copy of the power of attorney document should be annexed to the agreement. 

This is my response to you:

1. To lease a property there should be a registered POA;

2. A POA would not itself suffice;

3. If the POA is valid and not registered then it may not be admissible;

4. Consult a local lawyer, discuss the terms of the POA and take steps.

Yes if the POA is not cancelled you can lease property based on same and all the person in POA are alive. 

Yes you can enter into the transaction. 

Power of attorney is compulsorily registered for getting legal sanction. You need to register it

POA with consideration must be registered. Mere POA to authorize to act on behalf of owner, notorise is suffice.

for sale of immovable property registration  of POA is mandatory 

2)  notarised  POA executed in 2010 would not be valid for execution of sale deed

The notarized POA is valid for lease to sale or transfer the property to other person you need mandatory registration of property.

For a transaction involving an immovable property, the power of attorney deed may have to be by a registered document.

The lease agreement may not be registered with the help of the unregistered POA deed

Even though the POA was executed in the year 2009, for carrying out further transactions in respect of immovable property, it may be mandated that the same can be done only through  a registered document, you may enquire the same in the local registrar's office.

You have rightly heard that any transaction involving an immovable property can be done through a registered deed only  likewise the POA deed also has to be through a registered deed.

If it is prior 2010 but the transaction you are doing will be on current date in which poa registration required. For the same there are strict guidelines if SC

1. As per the information mentioned in the present query, makes it clear that there is a POA which is also registered and between the members who are in blood relation.
2. I would like to mention that as per the latest SC rulings in 2017, no property transaction can be done by POA or GPA or SPA unless the same has been executed in the favour of a close relative either blood or wife or husband.
3. So, your case is valid even as per the latest amendment. But, now comes the question of limitation period as to how long it would be valid that is the point to be looked into.
4. No time limit for expiry of a power of attorney, unless a specific time is prescribed in the power of attorney. However, a power of attorney expires on the death of the executor or the attorney holder. A POA may also lapses once the same is revoked.