I'd use all of that money to go seed the purchase of more properties and do BRRRR deals as long as they made sense.

It sounds like you found a bad seed, but in general, Realtors are a great tool and resource to guide you through this process. 

Why not seed the lawn in?

Anything requiring establishment (like grass seed, new shrubs, etc.) usually won't work once a tenant moves in as they won't pay for the water needed to keep anything new alive.    

Would much rather accomplish this with 100% independence, but if the seed money is needed I would consider. 

Therefore another alternative for investment is corporate venture capital and using real estate projections to get seed capital.

By my 2nd rehab I had learned that my seed corn was going to be exhausted if I continued to invest in deals brought to me by Realtor who could not tell me what the budgets would be to renovate a property and/or what the exit strategies might be for a property--especially given the holding and selling costs on flips.

Then continue flipping and use that $ for down and seed $ for MF either in cheaper areas of CA or in the midwest.  20 years of a little cash flow and pay off mortgages... retire with paid off houses.  

Imagine how many seeds you can plant if you put a 30 year mortgage on those properties, leaving 30% equity in each, taking that cash, and putting down 20-25% on a handful of other properties (or small multi-families) and what those “seeds” would grow to be in a few short years...Leaving homes paid off, in my opinion, are for those who don’t have much life left to live...

Funny thing, we wanted to participate with the rehab & decided to work on the yard, so we planted seeds & grass barely grew, so we decided to hire landscaper to do the grass!