Purchasing turnkey property

[Maritza Soto]

I have an opportunity to purchase a turnkey three family property. I'd like to go see the units but they "don't want to disturb the tenants" but I am able to look at the property and the common areas.  I understand that they may not want to let them know the property is for sale but is it a good idea to purchase without seeing the whole house?  Are turnkey properties usually purchased site unseen anyway?