IMHO, real estate and construction are my investment of choice. My thought would be to get the basics. A nice barn with an indoor, a good outdoor and lots of nice turnouts. If I were blessed enough to be in your situation I would start small maybe 12- 20 stalls, same number paddocks/pastures. Constructed to be expanded easily. Go middle of the road, safe, ultra functional. That leaves you tons of options, continue with current plan and grow organically or easy to lease or sell at a profit. By adding run ins you can go smaller on the stall count and still keep board income high.
Your investment needs to make money, so trainer needs to lease from you. Prime example, my business partner and I own a business. Business partner also owns our building under his property management company. Our business pays rent at current commercial rental rates to his property company. In this way he makes money off his investment. If our business fails or is sued, the property is not at risk as it is owned under the umbrella of another LLC. Now during Covid, when business was basically at a stand still our landlord offered us a rental offset until 3rd and 4th quarter of 2021. We have a nice Landlord.
So no matter the success of the business between you and your potential partner. You are receiving the facility lease income. If your business does not work out, you can explore other options as the property owner. Now as for making other income, your participation time should be paid separately on a base rate with profit sharing where applicable quarterly, biannually or yearly.
This is where the question lies…are you a person who can stick to the numbers, watch the bottom line and ruthlessly cut off employees, contractors, customers and possibly friends who are not profitable? Can you deal with someone who you despise because they are profitable Can? Can you build a facility that is streamlined toward customer desire and profit and not personal taste?
In every business there has to be a bad guy. Business partner is the money man, his brain is a calculator. I am minute man. My brain is a clock. We are both the bad guy. We have made hard decisions, we have fired people, we have told customers to take a hike, we have told suppliers off. We have dealt with people we both hate because they pay great. You said you owned a business, why did you sell?
I ask these questions because horse people are a funny lot. Most people inherently believe that horse barns are fun warm places. No, this a business, can it be that to you? If you have any doubt you would not be able to kick trainer to the curb after your first unprofitable year, invest your money elsewhere…