We had the damage fixed, cleaned up the basement and garage where stuff had gotten wet.

If the siding is exposed, wet it down before cutting and capture all debris on plastic and properly dispose of it).

Also, the box can have a brand new grounding rod installed along with new panel to dial in with todays codes.You will also want your electrician to install all the GFI outlets in the wet areas to also comply with current codes and the electrician should provide you with a wiring diagram of the entire house so you know which outlets and which switches are on each breaker.

Sounds like you are definitely getting your feet wet - a 4 family in NYC sounds VERY promising!

Then scale up to multi after you have your feet wet.

It's hard to believe a tenant took showers with the curtain pulled back and allowed it to spray on the floor every shower and leave the floors wet as he/she stepped out to dry off.

Maybe start with some sfh's and get your feet wet and when you're able jump into multi's. 

I think the wet bar is a nice amenity.

Great way to get your feet wet.

I just evicted a single mother who's son was flushing tampons down the toilet for fun. i had 3 main line clogs at $700 bucks a pop that I had to pucker up and suck down...the clog happened between my building and the street...so there was no ways of knowing what unit did it...well...on the last time I advised my plumber of the issue, and he was getting suspicious himself, and he found tampons stuck in the toilet and the main line, so the tenant coughed up the last repair on her own...and you better believe it never happened after that.