I can then focus my energy to make more money so I can buy more properties cash.  

I recommend finding a RE savvy CPA who can educate you and give you forward looking strategies to help you maximize your profit and tax efficiency.  

We are also trying to get one of the vacant apartments rented in order to improve the income produced as there are a lot of repairs to be made. 

I am always trying to improve my business.

There are two possibilities going on here and you didn't specify which one you're dealing with. 1: they work with a company that installs the panels, gives them free solar energy, and then sells the excess.

How much did they pay for improvements during the time they owned the property. 

Due to the risk of the deal falling through--it has happened to me at the closing table--I wouldn't ever do any major improvements. 

The building was doing well when I bought it but it is doing better today; and there is more room for additional improvement. 

@Wave TaylorI purchased a turnkey 3 family home 10+ years back in a C+ area and even though most of the improvements had been done, there were still a few capital expenditures that had to be handled within the first 7 years.

At least 2,600 victims invested their retirement savings, totaling about $400 million.Shapiro siphoned off $35 million for his own benefit, according to prosecutors, spending $3.1 million for chartering private planes and travel, $6.7 million on a home, $2.6 million on home improvements, $1.8 million on personal income taxes, $1.4 million for his ex-wife, and more than $672,000 on luxury automobiles.Roseman received $2.5 million for himself and Acevedo received $1.1 million, prosecutors said.The Securities and Exchange Commission’s previous enforcement action in 2017 was settled in January for a total of $1 billion in penalties and disgorgement of ill-gotten gains, the agency said.