Is there a major factor that employees 5,000 plus people?

If they are not a member and are contributing work and do not have a percentage of the company then they would be an employee of the company and be paid a wage...

Does that mean employees(W2) if there work doesn't offer 401K option, will have to stick with Roth IRA or Traditional IRAand stick with max contribution of 5.5K/year.

You will need to be self-employed (or own a business with no full time non-owner employees) before you can create a Solo 401k plan.IRAs are subject to UBIT for investments into an active trade or business and are also subject to UDFI for debt-leveraged investments.Solo 401ks are subject to UBIT for investments into an active trade or business but are generally not subject to UDFI for debt-leveraged real estate investments.

Landlord shall not be liable for any damage or injury of or to the Tenant, Tenant's family, guests, invitees, agents or employees or to any person entering the Premises or the building of which the Premises are a part or to goods or equipment, or in the structure or equipment of the structure of which the Premises are a part, and Tenant hereby agrees to indemnify, defend and hold Landlord harmless from any and all claims or assertions of every kind and nature."

This gives me the freedom to run my real estate business.The advantage of buying a larger business with employees is you start up higher in scale, you choose what you want to do.

I'm also a full time employee for the government so that was another factor. 

He’s buying a house for employees to stay when in town, and he wants to rent it on Airbnb when not in use. 

I stated I didn't want the employees, wanted to stay flexible, etc.

 To learn more about the 60 day rollover rule, see the following:https://www.irs.gov/retirement-plans/plan-participant-employee/rollovers-of-retirement-plan-and-ira-distributions