What can I assume about 300+ rental property Investor?

[James G chandler]

I am a licensed financial planner in San Jose with 16 years experience. I have developed an startup RE proposal and I am looking for an experienced RE investor. I have talked to someone who is a partner in a RE rental business with 500+ properties. His Linkedin page does not mention real estate experience. He wanted a business plan with a set of assumptions to give to his partners.

I want to submit a complete business plan, that shows I have thought everything through.

Can I assume that an RE company with 300+ rentals, has experience with flipping, a variety of financing strategies, with an ability to get 80-90 LTV. What area might they be weak in? What should I not assume?