Because of environmental issues I was the only bidder and bought the property for $115,000, fixed the environmental issue for under $2000, and 4 months later completed a sale of the property at triple my purchase price.

I'm speaking with an equity investor & they've given me rough estimates of ~6-10% interest rate + 1-3% origination fee + their equity position (20-30%) is it just me or are they double/triple dripping? 

I’ve realized that not only is it possible but very easy to accomplish through double and triple checking your numbers.

In many retail buildings, the leases are triple net, which means that the tenants will pay the cost of taxes, insurance, and maintenance.  

And by the way, what you are talking about as far as the tenant being responsible for the expenses, taxes, insurance, maintenance, etc... that is what is called a Triple Net Lease here in the US and it is not uncommon for some commercial applications.Hope that helps.Ivan

In some states the landlord has to give written notice if they are keeping any of the security deposit and this notice has to be sent within 30 days.I say this because in some states if the landlord keeps the security deposit and doesn't send notice the tenant can get double and some states even triple the amount back.

Commercial real estate is highly specialized.My focus is triple net and apartment buildings.I am my own company and the principal broker and owner.If you are cold calling 2 to 3 hours a day you are either calling the wrong people,handling the call wrong with tone and duration and what you say,or you are doing both.Tell me about the one deal you closed.Size,purchase price,how you handled it,etc.

I hope to triple this in the next 8-10 years.  

For me it's apartment buildings and triple net leasing.

I would suggest creating a detailed plan with daily action items, build a network that is triple the size of your current network, and be prepared to make a lot of mistakes!