Open to listen to all advise and if any of you can actually help with property acquisition.Understood the whole deal/process is not a cake walk and there will be lot of hurdles.

I'm curious how others get past this hurdle considering many RE investors don't have traditional W2 jobs.

I don't think it is unreasonable. 

We have artificially raised lots 1 and 4 to unreasonable levels, because we don't want anyone living in front of us or to the side. 

Yes, but you need to narrow it down a lot to have a coherent answer.You will have to look at (I'd recommend in this order) the city codes (if it's inside a city, many cities above 50-100k population aren't friendly to development of these), the county codes (most counties are friendly to these, but you will probably have significant issues in major counties like Bexar, Travis, Dallas, Denton, Tarrant, Harris, etc), then you will have to comply with the state-level (TCEQ and others) on the water supply and waste water treatment systems.To put it in perspective again, in say Dallas or Austin, you will likely have prohibitions or very significant hurdles on developing RV or tiny home properties even on unincorporated, "unrestricted," AG-zoned properties at both the city/municipal level and county level.

Is this an unreasonable request?

The hurdle I working through now is that despite the fact that I have enough saved to buy a house outright (not necessarily the best avenue), I have not been able to meet standard lender's gates. 

Some more detail and my thought process:1) I could sign a long-term parking lease/agreement (10-years or so) for the 6 spaces so that the potential buyer would have confidence that he would have access to parking.2) I could devise a parking easement (compensated by a higher purchase price) for 6 spaces, but I'm hesitant about the implications down the line should I want to sell the lot/land or redevelop it in some way. 3) I'd rather not deed out a portion of the parking lot as part of the purchase agreement for the buildingAm I being unreasonable or can anyone suggest another solution?

If you want to keep the property as an investment, figure out how to get over this hurdle and hold onto it.

So I decided to jump the hurdle and took some time to learn the commercial financing component so that I could move into larger multifamily properties.