I was thinking if they resurface the entire asphalt (not just to their access - they did not pay for any of the initial asphalt or purchase it) and agree to 25% of maintenance forever (they would be the 4th owner to use the access) then maybe we should allow access. 

To me it feels like you are pretty much just in your units for an appreciation play... which is fine... but while you wait for that to happen, you have to deal with the in-between... which are the repairs, the condo assessments for new pavement or roofs, or anything else they can dream up they want to replace... the pool, etc.  

.- Look in the crawl space and attic if you can (always have a pocket flashlight on you)- Roof-Chimney- Gutters/Soffits/Downs- Paint/Siding- Electric Service Drop (older homes with above ground wires)- Electrical Breaker Box- Exterior Doors/Jams- Porch/Deck- Termite Danger (ground is near wood)- Land Grading (for water runoff)- Cement/Asphalt-Retaining Walls-Garage (Door and function)- Landscaping-Trash Cleanup- Windows-Interior Doors-Strip Wallpaper-Drywall-Patch & Paint- Flooring (carpet, vinyl, hardwood, tile)- Ceiling Repairs-Water Damage-Trash Removal- Kitchen- Kitchen Appliances- Baths- Water Heater- Water Service Line- Water Plumbing-Waste Plumbing-Check water pressure -Electrical- Joists- FoundationTips - Check the property at different times of the dayThe street may be peaceful and quiet in the morning but in the evening, it may overflow with traffic.

Servicing 36,500 sq ft of the parking lot with 110 parking spots, replacing 160 linear ft of extruded curbing, and 1620sqft of asphalt patching, for a total of $13,375.

Were the repairs specific to the property itself (pavement, landscape, a private website,...) or were they more unit-specific (sealing concrete blocks, replacing doors,...)Would you do this strategy again, flipping Storage to afford Apartments?

Possibly packed Cliche and or asphalt regrinds.  

For example, call a roofer and ask what their average cost per Square of Architectural Asphalt Shingle Roofing would be on a 1,500 sf house, with a 6/12 pitch.

Maybe try some good old fashioned pavement pounding?

It has 47 units with 70 asphalt parking spaces and a parking ratio of 1.6 spaces per unit.

It has 47 units with 70 asphalt parking spaces.