Good afternoon @Kobina GrantWelcome to Bigger Pockets!

Is spending thousands on a sprinkler system worth it or do I have other options? 

Philly is a nice option, but you have to study the blocks for about a year to be sure you understand the area you are investing in.

In your case of a fourplex, option 2 should get you a better deal.I would also agree with Bill on how the number of units may not correlate with the value of the property unless it is a large multifamily complex, and sometimes a fourplex or several single family houses would give you better returns. 100% We always recommend conventional first until you can no longer qualify for those. 

There are many options, but I like TransUnion SmartMove the best.

The oener finaning option.

I'm not super educated on the options.

We overthink real estate...Just find a place that people with options want to live. 

.$70k out of my pocket cash and sell the house when it is done for $360k to $400Kclosing cost $40k so 360 - 40 = 320 - 270 = 50K profit or 400k - 40k = 360k - 270k = 90k profitthe $360k is conservative for sale price chino hill ca.at least that was what i had bouncing in my head

If you don't have free cash available that limits lots of options, but if you do, that is another story.