Looking to analyze a commercial office building

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I'm starting off I inherited some very good commercial rental properties and am looking at another to invest into I'm looking to buy and hold , it is listed with a big broker, the property is 100% occupied by large tenants they have leases till 2022 with 5 year options.ot is a 16000 sq ft office built 1986 with elevator, 100 parking spaces. The proforma says 442k per year gross rent 34k maintenance and 133k taxes per year ,I checked the town on taxes only as up to 116k taxes ,. Asking 4.4m, my question is how do I approach the broker to get the actual #s and start my own real breakdown, I'm not afraid of the bigger numbers I am in my and have been managing the property I inherited for over 7 years I'm a newbie to investing but not to being a landlord as much my personal opinion is commercial is so much easier and profitable. I always was shown to think bigger, just do it intelligently thank you for any advice