Financial Adviser here as well. Personally, I believe that it depends on where you are in your "life cycle" and where your RE business currently stands.
For instance, if you're 25 years old, you most likely won't need to make withdrawals from your investments to support your lifestyle for ~40 years. Therefore, you have a higher risk tolerance because you have more time to recover from recessions. This is called the early accumulation phase. It is very similar to when a new company is spending large amounts on R&D and CapEx. At 31 years old, I am in this phase. I invest on a 1:1 ratio ($1 to my 401k, IRA, brokerage account : $1 to down payments on RE). However, I have about 80% of my net worth in real estate and 20% in equity investments. This is purely because my RE has performed very well.
Late accumulation phase and decumulation phase investors should consider getting advice. This is because a portfolio's Beta is much more significant when you are making withdrawals on a regular basis. You need a very diversified portfolio where one investment balances out the others. This is why you see may investors begin investing a significant portion in bonds at this time. High correlation is a killer in the decumulation phase. Have a professional run a Monte Carlo simulation and you will see how different allocations affect your likelihood of success.