These aren't necessarily agents associated with that property, but you can see on that page how many recent transactions they've had and a customer rating, and click through to their agent biography. 

There will be something associated with turning units when people move out, which you should have as you raise rents.

Here is a link for a list from Bigger Pockets. https://www.biggerpockets.com/renewsblog/wp-conten...If you find a great flip, bring it to your local REIA, Real Estate Investment Association. 

As used in this chapter, unless the context otherwise requires:(1) “Real estate broker” or “broker” means (A) any person, partnership, association, limited liability company or corporation which acts for another person or entity and for a fee, commission or other valuable consideration, lists for sale, sells, exchanges, buys or rents, or offers or attempts to negotiate a sale, exchange, purchase or rental of, an estate or interest in real estate, or a resale of a mobile manufactured home, as defined in subdivision (1) of section 21-64, or collects or offers or attempts to collect rent for the use of real estate, and (B) any person, partnership, association, limited liability company or corporation employed by or on behalf of the owner or owners of lots or other parcels of real estate, at a stated salary, upon commission, upon a salary and commission basis or otherwise to sell such real estate, or any parts thereof, in lots or other parcels, and who sells or exchanges, or offers, attempts or agrees to negotiate the sale or exchange of, any such lot or parcel of real estate;

I buy condo's because they are very easy to manage as the association takes care of almost anything that will go wrong with the unit.

Cost for the property associated with developing the land before construction will vary based on grading, sewer, electrical, roads, surveying depending on the location of the land, soil testing, etc...

Wow, I can't believe I left out how attending and later joining some local REIA's: AZREIA and PREC were and are very important to me and help me associate with successful people and the right mind set!

Get some listing from Marcus and Milichap or CBRE, for example.National Apartment Association is a good source of aggregate data. 

The short answer is that you will get credit for everything that has a written and transferable contract associated with it.Not all side income will be counted towards forcing your appreciation.

When you are in a condo you have more variability from the condo association that you can't control.