Then, the builders came from all over the country as South Tampa became the number One place in the US to buy Tear Down wooden houses to build Two Story Block houses and Townhomes, with 80% building square footage to lot size.

Would depend on the loan amount size.

Any recommended billing service providers that service my property size in CA?

Intel will be even longer because of the sheer size, it'll house 8 chip factories and additional supporting operations over 2,000+ acres.

I scored a 5.9% with my bank on a decent size loan but that is with a 40% down with really good cash flow.

Many of the property managers talk to each other and compare notes and share marketing ideas and 'run comps' on each other.The other option would be the 'enemy method' to search for similar size home within your community and others close by with similar amenities and scour their calendars. 

In my case because of the demand, having a number of apartments of similar size and scale helps with keeping the vacancy low.  

A Florida room that has full-size bar overlooking your private pool a serene oasis with a cascading waterfall.

lower the size of your unit and therefore your build cost per unit, your sale price will go down but focus on density and get familiar with zoning and what your city will approve. my best suggestion is to do it in downtown districts where there is unlimited height and unlimited floor area and you can build every square inch of the property and reduce parking because of proximity to transit. property values are higher, rents are higher in downtown markets, there are just too many economies of scale compared to suburban deals.

My knowledge is limited and there are obviously variables in location, size of units, amenities, expenses, TI, etc.