I own a small cleaning company that specializes in specific services that prepares properties to rent or to sell, which is how I was introduced to teal estate. 

Look for a small/mid size local bank that specializes in this, they will detail what you need, survey, building permit, architectural plans and a builder contracted for starters.Or when you're ready to subdivide/redevelop you just sell to a builder and have them split the lots and transfer title to you for your smaller lot, he keeps the others and let him mess with the utilities and building. 

I would try to find an attorney that specializes in real estate disputes.

For bigger renovations or repairs that require specialized skills, it’s usually best to bring in a pro.

You can network with all sorts of local investors that may be doing what you want to do or attend focus group meetings to specialize in niches like multi family, flipping, landlording and more.

Fast growing town, but boring townhouse/nothing special. 

I can refer you to an accountant that specifically specializes in working with H1B visa holders.

Specifically, I'm looking to see whether anyone has an agent that is specialized in these two areas.  

If you plan to expand your portfolio, starting with a 4-plex might provide a stronger foundation for future investments.It's also worth consulting with a local real estate agent or financial advisor who specializes in investment properties to get personalized advice based on your financial situation and market conditions.Best of luck with your investment!

That's what they specialize in.Is this in LA?