Peter,
I am a CRE broker and while your current financials are decent, unlike qualifying for residential R.E. the property you're buying will have to be able to service the newly acquired debt.
I gather you're a first time investor in the commercial arena. That is not a problem even though many lenders prefer borrowers with experience. So, to compensate for the limited experience you may need to prove strong compensating factors such as:
1. Good property, with a high occupancy level, in good condition (no deferred maintenance or major structural issues), in good location (one with a great local economic growth) where absorption rates are high, good property management in place.
2. Good liquid reserves left after you close on the property. You raise the lender's level of comfort by proving you'll have money to handle emergencies.
3. If you have experience with residential R.E. that is worth putting on your BIO.
4. Finally, how your package is presented could make the difference between approval or denial.
OK, to try to give you an estimate I figured that a $90K down payment could help you purchase a $300K property at a realistic 70% LTV. I try to use more conservative figures. You'll probably get others to convince you they can do a 75% or higher LTV but I think you should keep your head on your shoulders and feet on the ground. If you do get approved for a higher LTV consider it icing on the cake but don't make your decisions based on that.
P.S. If you have other liquid assets, such as securities for example, then we can go higher on the down payment and consequently the purchase price, and use those assets as reserves after closing.