Cost associated with subcontractors (a general contractor subcontract the asphalt and earthwork job, and they charge 10% of the subcontractor price), plus compaction equipment and personnel, overhead and profit of the general contractor, insurances, etc.I would recommend taking in consideration adding costs such as permitting, storm water pollution prevention plan (fees, silt fence, straw bales, and such things), Engineering Services, any City or County fees for the projects, inspection and material testing costs?

Landlord association dues.  

Almost all associations have provisions built in against short term rentals and the fines can be massive.

The Houston Association of Realtors have made a multi-year agreement with Remine, who provides data and analytics to its clients, as announced by the firms on Thursday.

They have shown their true colors and how they choose to conduct business and it's not something I want to be part of or associated with.Established brokers/agents have a solid pipeline of leads coming in and can craft their business model to how they want to operate.

I have right of first refusal to an associates property in Charleston.

If you still are uncomfortable or at risk, then form an LLC that doesn't have your name associated with it.

If Buyer is required to have an updated or new survey, Seller will pay associated cost.

They are associated with Trans Union (one of three credit score companies).  

The expenses that you are referencing are more associated with business expenses not passive investment expenses.