Agents/Owners Not Providing Cap Rate/Financials

[Israel Flores]

Hello! First post here, I have been a RE Agent for 10years but just now getting into multifamily and light commercial. I am currently helping a client find & purchase a 2-4plex, but I am finding many owners/agents not providing financials, rent rolls, or info needed to determine a cap rate even after asking. Is this normal? 
Wondering how my client can make an informed decision without some of this info or do we just pass on those properties? 
Any insight would be appreciated!

TIA! - Israel