I've been in Indy since April and have learned a tremendous amount. 

What's the maximum amount of units you could build on 0.68 acres?

In addition, employer contributions may be withdrawn upon the occurrence of any of the following events:1) The occurrence of a Hardship,2) The attainment of age 59 ½3) The employer contributions being withdrawn have been accumulated in the solo 401k plan for at least 2 years; or4) The participant has participated in the solo 401k plan for at least 5 years.Salary Deferrals(employee contributions): Any employee contribution (including any earnings on such amounts)may not be distributed prior to the solo 401k participant’s severance from employment, death, or disability.

Driving around I was amazed at the amount of inventory on the market. 

It sounds like you might be an accredited investor based on the amount of equity you have, so you could potentially put part of the money into a syndication.

The remaining amount goes into a spending account.

There was no max amount that could be charged over the years, or limit to how high or often the HOA fees could go.

(That's owner occ, sfr, 20% down, no HOA, perfect FICO, and loan amount below $450k at a cost of 0.5 to 1 pt.

Can the investor credit the tenant/buyer an amount equal to the option fee at closing as long as it's in the purchase agreement? 

I personal had insulation redone in my house and low and behold when I sold it it was worth a percentage of that amount higher than I thought because of the way it adds value.If you have any further questions please tag me.