Syndication Return Data?

[Jake Wiley]

Does anyone know of any good third-party data sources that show typical multi-family or commercial returns for LP's over time?  

I am looking to augment my podcast with third-party data to help my listeners get more comfortable with the return profile.   I am hoping to avoid highlighting any individual syndicators to avoid the perception of bias.   

Any help would be great, and thanks in advance,

Jake