In addition, if you own an office building, you will be negotiating against lots of very experienced people sitting on the other side of the table from you.

A mentor/partner/experienced investor, 2.

As 2 experienced investors -  @Brian Burke and @Ivan Barratt - have pointed out Excel is the way to go. 

Tampa Mayor Bob Buckhorn has been an advocate for the development, and economic investment for the area and his efforts are bringing results.Development Projects in TampaOver the past few years, Tampa has experienced higher rates of real estate investment, especially in large community projects.

Recommend you also join a local real estate investment club and rub shoulders with other savvy & experienced investors.

Finally, with the use of Trusts while establishing these structures you can add a level of anonymity by removing your name from public record.When you ask that question it would probably be best to sit down with an experienced attorney and have them walk you through your personal exposure.

I've known homeowners who have had to hire contractors/engineers to write letters that no repair is necessary - this really enrages homeowners when the suspected error is really obvious. 

Things progress from there to scaling with larger multi-family properties, commercial real estate, and so on.I'm wondering what experienced investors would do with the knowledge they've gained if they were starting from scratch and had $500k-$1m starting capital.

Any advice from experienced investors on what I should do next?

The metrics seem to be in the range I've learned about, but it's my first deal and I'd sure appreciate far more experienced eyes to look at these numbers and tell me if you see something wrong.