The property is currently fully rented with long term tenants and leases in place.The building has been well maintained, but what is your recommended maintenance percentage?

If you maintain the lawn, you may want to consider hiring an inexpensive lawn entrepreneur to do it for you. 

I'm sure your service is great for a tenant responsible enough to maintain a bank account.

If you are doing long-term hold, you will also need to consider how you maintain your assets as well.  

When you invest in real estate, for example, and want to maintain reserves, some should be in either cash or a comparable asset such as a money-market or CD, but you can easily put excess reserves and earnings from real estate into traditional stocks, funds, etc. as well - it doesn't just have to sit there.  

The age of the house is important, because even if its a well-maintained house, its going to have an older style floorplan.  

Gotta be stoked to get the base hits or the grand slams. 

I really did want to learn REI while maintaining the job somehow.  

I had read somewhere that some people use 1% of home value as an annual budget for fixing/repairing/maintaining the home.  

I can live off of that without being to Frugal .. and I think putting $6500 a month off to the side to cover taxes and expenses for the property would be more than adequate enough to maintain the property and pay taxes.insurance,  etc..