Example if you have asphalt shingles and replacement is $10k (you may have tile with longer life and higher cost so works out to be close to same) at 20 years is $500/year or just over $40/month.  

I have five years experience but the contractors I work for all have over ten years in the fields of dry wall, stucco, asphalt and paint. we aim to bid lower then many not because of the quality but because we are eagered to show  the good work we provide. 

And then I need additional crews if replacement concrete or asphalt is involved.  

They needed pavement and some TLC, but were very clean. 

At our company, we like to be in the middle - self performing and hiring really specialty subs (say asphalt and trench subs), we are the GC where we control costs and schedule, we never missed a deadline, we assure that we assign the right crew and subs to the right client, a government client will not be assigned a super that only did bathroom remodels for 10 years, nor a residential client will be assigned a super that does ground-up schools.

I have discovered an alternative to treat asphalt shingles to help us on the selling end in the future.

If they require concrete or asphalt then it is better to build the largest units you can. 

A) LocationB) LocationC) LocationPounding pavement and knowing your location is the keyMy .02

Do you include the costs of parking lot/asphalt/concrete/traffic control devices in your maintenance budget?

In Charlotte the costs for an Asphalt street(including all utilities) is approximately 800$ per Linear feet(30 ft width).