One particular lender and when I say Lender, I’m talking about the individual loan officer that we have worked with in the past had a number of his Lending policies changed so we had to start using someone else when he did not have a product that fit .I realize that a number of the replies have come from lenders themselves so they’re looking for faithful customers.

We have a few custom builders who put out maybe 10-20 a year, mostly high end

Totally doable if that sounds like something you're willing to do.If you were looking to go that route, I'd recommend getting a Customer Relationship Management (CRM) software to keep track of leads and follow-ups.

If its a very large property, you may also want to make sure you are marketing to any wedding, family reunion, corporate meeting/team building customers. 

As soon as you start discussing your business practice and strategies with your customers (tenants), then all bets are off and you run the risk of Fair Housing violations. 

The long term goal is to do custom homes, starting with spec builds.

If the product/contract/service I offer is not suitable to you then I don't want you to be my customer.

Excellent customized spread sheet. 

They offer flexibility in design and can be customized to include a business space.Shipping container homes: While trendy, these can be challenging for mixed-use (residential/commercial) purposes due to zoning and building code issues in many areas.

The software allows me to generate custom reports on my rental income, expenses, and overall performance.