How do I approach a management company about negotiating a lower rent for a property that seems overpriced?

I found a property that is the perfect size and location for my family but doesn't seem too well managed, fixtures in the kitchen and bathrooms don't seem to have been updated in at least 20 years and the place will need a deep cleaning before we move in even though they are saying it is move-in ready. I don't know anything about the owners but it is managed by Orange County Property Management in Huntington Beach, CA. The place has been vacant for at least 2 months and there are a ton of other properties in the area that are sitting vacant also. Some go faster than others. The rent they are asking is $1850 and I'd like to pay closer to $1650-$1700. Is that reasonable? How do I approach them about it? We have not yet applied for the rental but we have good credit, are married with one child, and have perfect rental history. We can probably get a letter of recommendation from our current landlord as well.