Deal or no deal? Buy and hold condos

[Siraj Ahmed]

Would you buy a package of condos together without physically viewing  ALL of the units? the seller/PM does not want to show all of them and instead said they would show me 3-4 out of the 10. 

A little background on this...he has sent me all the rent rolls, leases and addresses. All the apartments are rented out. 

Should I be comfortable purchasing ALL the units if I am not able to see them? What would your counter be to someone who says I can only show 3-4?