Buying commercial property - Mortgages

Hi all,
Can anyone give me some guidance on buying a commercial property.

I need to get a loan, are the banks the only place to get the mortgage ?
What is the typical deposit needed, 10%, 20% 30% ?

Its a new property and I have a tenant lined up ready to sign a long term lease, should that help with getting the mortgage ?

Any thoughts on this would be appreciated.

Thanks

Based on policy of Bank that I work with bonanza

20% deposit, fund stamp duty fees etc yourself
It will be a massive advantage to have long term tenant lined up, full FRI lease for over 20 years will give great comfort to any lender

Bank is probably only place to get financing for this id say alright

PM me if you want any further more detailed info

Regards
DC