@Antonio Palumbo , welcome.
Many investors on this BP forum are mostly interested in an investment property that cash flows. I'd encourage you to read up on the BRRRR method, as one way to grow wealth the quickest, and it works best if you use high leverage, (i.e. you have minimum equity in the property and maximum loan size).
Read on these forums the targeted "2% Rule", wherein you buy a rental property that has rent per month equal to 2% of the purchase price. (if your $3,150 per month place in NYC could be purchased for $157,500 , then you'd be in the best zone for cash flow. I'm guessing NYC isn't a 2% City....yes, many of them are in the Midwest with a $50,000 home bringing rent of $1000/mo) Note that this rule is independent on how you finance the purchase, or how much down payment you put into it.
Then, investors try to finance the property such that with 20% down payment, 80% loan, and considering other insurance, taxes, maintenance, capital improvement, they get net cash flow of +$300, per month per property. They then calculate their return on capital as the $300 per month ($3600 per year), divided by a $20,000 down payment (ie. 20% down on a $100,000 unit) and calculate that they are making 18% APR on their cash employed. Note that the 18% cash on cash yield is possible with 20% down payment, in this case. A person paying 100% equity and no loan, will calculate a higher net cash flow per month (without a mortgage payment) but will have a dramatically lower cash on cash yield.
Note that this "cash on cash return" is just the cash flow compared to the cash invested, and ignores the principal repayment by the tenant, and ignores any market appreciation (if any).
You are getting comments above because you have a -$175 per month cash flow, and therefore, your "cash on cash return" is negative. You are hopeful that you still have a viable "investment" because you like the tenant paying down your principal monthly (growing your equity, but not cash in your checking account). (@Cody L. is correctly making this distinction, and clearly strives to have the monthly cash flow.....his equity growing by $50,000 per month is not to be ignored however...... but he'd have to sell a property and/or cash-out refinance a property to convert that unrealized gain into spendable cash, and may have a taxable capital gain to pay tax on, too).
You haven't stated, but you might have $300,000 or $500,000 tied up in your down payment and growing equity over the past 8 years. Others are questioning why you would be happy with no cash return on that investment. You could instead have it invested in indexed mutual funds and get perhaps 8% yield, without all the risks and headaches of real estate investment. Folks like @Thomas S. are correctly pointing out that the "opportunity cost" of having so much of your capital tied up in your down payment is only effectively earning you about 4% yield (if your mortgage is 4% APR)....and why not extract it and put it to work in a property yielding 15% or 18% annually.
So, if you have $500,000 equity in the property and are happy that you're getting $700 per month in principal repayment, that's only a 1.7% annual yield.....you'd be better in a different investment.
I looked at a housing index for NYC....looks like it's up about 10% in last 8 years.....1.25% appreciation per year. So, you might be getting 1.7% from principal repayment and 1.25% from appreciation....are you thus netting just 3% annually on your risky investment?
Good Luck.