Thanks for not being helpful! This is for people who have dealt with this type of thing or ppl who handle things like that on a daily basis! I think i mentioned above that i did that..

I handle this sort of thing on a daily basis and what I can tell you here is: this is a complicated issue that depends on far too many factors for anyone to help you here:  the % of developed lots on the block, the sizes of the lots, the uses of the existing lots and your proposed use(s), the FAR of your lot and the others on the block, whether there's already one or more buildings on your lot, parking area and types, setbacks, scale, height, street frontage, yard depth...  There's no way that somebody can give you an answer without at the very least examining documentation on your and surrounding properties - which is work for which you need to hire someone.

Getting information for free is nothing wrong with that, i dont understand why ppl get so upset about that, thats why they are forums made to consult with other knowledge and experience. ALSO, to know your situation in anything, it should be easy information out there for you to read and educate about whether your property or whatever you want to know and IT IS out there that info but as i mentioned above not so easy for me right now therefore i opened a topic here!

I ONLY asked about my zoning, but as im experiencing here, ppl like to be hateful and to complicate things.

So the OP bought the house for a tad-bit below a cool one million back in April but can't afford a few hours of an architect's time.  Pure wanker.

https://www.zillow.com/homedet...

Thanks for giving me this free information! Maybe you should go find a real job then you're not gonna be that angry with someone purchasing a house instead of being on your computer and cluttering it with stupid comments to waste other ppl time on reading it. #realfreeadvice https://www.monster.com

If you change the 'NY' in your address to 'OR' you'll get tons of free advice. Try it out.

I can give a yes or no answer for $50, without measuring or calculating
anything. I'll just require signing of my terms and conditions which
explain that my zoning predictions are for entertainment purposes only.

These are the regulations pertaining to R5 infill, to demonstrate why it would be necessary for someone to do investigation into old tax maps, C of Os, block frontage, etc.:

On a block entirely within an R5 district (without a suffix), R5 infill regulations may be used to develop infill housing in predominately built-up areas, if at least 50% of the area of the block is occupied by zoning lots developed with buildings, and the lot does not exceed 1.5 acres (65,340 sq ft). However, infill regulations may not be used to redevelop a lot occupied by a one- or two-family detached or semi-detached house unless the blockfront is predominantly developed with attached or multi-family housing, or commercial or manufacturing uses.

On sites that qualify for infill housing, the higher FAR of 1.65 and more relaxed parking requirements permit developments with greater bulk and more dwelling units than are otherwise permitted in R5 districts; infill regulations typically produce three-story buildings with three dwelling units and two parking spaces—one in a ground-floor garage and the other in the driveway. Infill regulations can also produce small apartment buildings.

To ensure that infill housing generally conforms to existing neighborhood scale, height and setback regulations for R5 infill housing are the same as for R5B districts. The maximum street wall length for a building on a single zoning lot is 185 feet. Front yards must be at least 18 feet deep to prevent cars parked in the front driveway from protruding onto the sidewalk. Off-street parking must be provided for at least two-thirds of the dwelling units.

A "predominantly built-up area" is a block entirely within R4 or R5 Districts, including a Commercial District mapped within such Residence Districts, having a maximum area of four acres with buildings on zoning lots comprising 50 percent or more of the area of the block. However, a predominantly built-up area shall not include a block which is located partly in an R4A, R4-1, R4B, R5B or R5D District. 

All such buildings shall have certificates of occupancy or other evidence acceptable to the Commissioner of Buildings issued not less than three years prior to the date of application for a building permit. Special optional regulations applying only to zoning lots of not more than 1.5 acres in a predominantly built-up area are set forth in the following Sections:

Section 23-143 (Optional regulations for predominantly built-up areas); Section 23-22 (Maximum Number of Dwelling Units); Section 23-44 (Permitted Obstructions in Required Yards or Rear Yard Equivalents); Section 23-631 (General provisions); Section 25-22 (Requirements Where Individual Parking Facilities Are Provided); Section 25-23 (Requirements Where Group Parking Facilities Are Provided)  

The regulations applicable to a predominantly built-up area shall not apply to any zoning lot occupied as of October 21,1987, by a single- or two-family detached or semi-detached residence where 75 percent or more of the aggregate length of the block fronts in residential use, on both sides of the street facing each other, are occupied by such residences as of October 21, 1987. However, the regulations applicable to a predominantly built-up area may apply to such zoning lots where 75 percent or more of the aggregate length of the block fronts facing each other, on both sides of the street, is comprised of zoning lots occupied as of October 21, 1987, by commercial or manufacturing uses.

alternately, OP, read the zoning code, talk to/meet with the local planning dept to clarify, and do the research for whatever it is you'd like to propose for the project. keep track of your hours and think about how free & simple the info turns out to be

seems clear this question isn't as simple as you'd like it to be

Even if you don't like the curt "pay someone" responses here, at least take the lesson that this is not a simple matter.

Code consulting has thrived as a cottage industry precisely because of all this complexity and uncertainty around a subject with potentially high financial stakes.