Office 365 Split domain question

Is it possible to run an on-premise Lync hosting 1 SIP domain, with on premise Exchange running a specific email domain say company1.com
Then have Office 365 host two other SIP and email domains. Company2.com and company3.com
I am trying to get my head around this configuration, or if it's even possible.

It's documented by TechNet:
http://technet.microsoft.com/en-us/library/jj205157.aspx
For outside documentation, a lot of what I'm seeing is outdated, so TechNet may be your best source for up to date information. 
And the answer to the DNS question is, it depends.  If you're Office365 only for those sip domains, and on premises only for the other sip domain, it doesn't necessarily even need to be a hybrid deployment.  That said, if it is and users can
cross from on premises to off, the DNS records should point at the on premises deployment:
"When creating DNS SRV records for hybrid deployments, the records, _sipfederationtls._tcp.<domain> and _sip._tls.<domain>, should point to the on premises Access Proxy."
http://technet.microsoft.com/en-us/library/jj205403.aspx
Once they hit the on premises, they will be redirected to the online deployment if that's where their account is homed.
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SWC Unified Communications

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