Protocol for performing due diligence in tenant-occupied place?

[Paul Winka]

In performing due diligence for buying a property that is tenant occupied and in dealing with a seller that says "do not disturb" tenants, how is one supposed to inspect the property adequately without disturbing the tenants? There could be mold growth, termites, and who knows what else happening in that property. 

Is it normal to just make a contingent offer, put up earnest money, and THEN proceed with an inspection? I would prefer to do an eyeball inspection of the property inside first to see if going further is warranted.

I suppose what answer I am looking for is what the protocol is for buying a multifamily or 5+ unit place that is occupied while performing full due diligence and being respectful of tenants and the seller.

Thanks!