would you rent in this situation? investor to buy property

yes the lease will protect u to state that when it is sold your lease will be valid, etc.. ask your agent to point out that paragraph to you

Thanks. Is there anything else that we should ask for/do right now?

I think you should ask to speak to the investor and feel them out for how they will handle things like a renewal in 12 months, maintenance, what he thinks of the contract you are about to sign, etc. If they refuse, figure out why and ring the bells in your head.

Crescent is correct. Your current lease will be binding, but it's entirely possible the new owner will decide not to renew because he wants to convert the unit, etc. So you very well might find yourself having to move again when your current lease expires. Also, the new owner could decide to begin renovation work on the building--do you really want to deal with the din of power tools in your new home?

I think it's not a great idea to rent in a building that's being sold or is otherwise in a state of flux. Too many what-ifs.

Your lease will be binding for this lease term. After that the new owner can do whatever they like, unless it is a stabilized apartment.
I would be happy to know it is an investor buying, not an owner occupant...more likely it will be run like a business.
You'll never get to speak to the investor...not now.
All you can be certain of is you lease term and the terms of the lease...
I would not worry...it is the same as it would be with the current owner.

UWS_rental: Read your lease carefully. You want to make sure that the lease is not terminable if the property is sold.

Thanks. In this scenario, the building is not being sold, but the unit. We have been presented with a standard Blumberg lease.

If it is the standard condo lease "A101" you will want to cross out clause 17 ("Sale of unit. If the Landlord wants to sell the Unit Landlord shall have the right to end this Lease by giving 30 days' notice to Tenant....")