I've been tracing wholesalers in califonia for months, like nothing other state finding individual wholasalers in califonia is quite challenging I don't know if it's because the house prices are too high compared to other markets.

Even if you tell me they are paying cash or very high down payments , shouldn't the price of multifily  buildings reflect its NOI/cap rate? 

If you want to quote out high efficiency boilers for six Tripple deckers for example requiring installation of separate gas, meters etc. etc. - that might be a situation where you would want to work with a contractor directly because you would have lots of different options with widely varying costs.

:Class A Properties:Cashflow vs Appreciation: Typically, 3-5 years for positive cashflow, but you get highest relative rent & value appreciation.Vacancy Est: Historically 10%, 5% the more recent norm.Tenant Pool: Majority will have FICO scores of 680+ (roughly 5% probability of default), zero evictions in last 7 years.Class B Properties:Cashflow vs Appreciation: Typically, decent amount of relative rent & value appreciation.Vacancy Est: Historically 10%, 5% should be applied only if proper research done to support.Tenant Pool: Majority will have FICO scores of 620-680 (around 10% probability of default), some blemishes, but should have no evictions in last 5 yearsClass C Properties:Cashflow vs Appreciation: Typically, high cashflow and at the lower end of relative rent & value appreciation.

The rules are designed to prevent related parties from engaging in exchanges that shift high basis property for low basis property, followed by a sale of the low basis property, effectively "cashing out" without recognizing gain.If you sell a property to a related party as part of a 1031 exchange, both you and the related party must hold the exchanged properties for at least two years following the exchange.

I wanted to share my situation and get some advice.I currently own an apartment in a highly developing area in Guaynabo, PR.

The rates are high right now but these loans are limited based on cashflow so you cant take a loan that costs more than you're receiving in rental income.

cash flow is still fine with the high rates.

Highly recommend @Lien Vuong she commented below and has helped a lot of our clients start of expand their investment property portfolio. 

While I don't object to spending money to do one's due diligence, I don't know if $500 is called for when you can get very high quality syndication groups/meetups/information for free.