i got this off some of the threads. over here we have big city blanket zoning for a block of say RM, residential/multi use, or past commercial use, all row homes, so with a single family row home i need to say why the h&b use isn't 2 family use, or commercial use, mixed use, etc. just switch 'use' words. i say 'see addenda' on front page. nothing original here, mostly from the brains on this site, whom i thank:
Several of the blocks have blanket zoning of RM-1. Under this zoning single family residential & multi family uses on the same street are permitted. Single-family dwellings do not require zoning approval. The majority/mostly all dwellings on this block are single family, residential, but may be characterized by a mix of housing types, including detached houses. There are 4 RM districts. These districts are differentiated primarily on the basis of allowed minimum lot area per unit and allowed building heights.
The four tests of highest and best use are: (1) legally permissible (2) physically possible (3) financially feasible and (4) most profitable. The first two tests are interchangeable in order and, the last two are often are combined. Steps Three and Four (financially feasible/most profitable) cannot be determined until the first two steps are analyzed..
Test 1: current use if legally permissible; unit would also be legally permissible
Test 2: the current use is physically possible. multi-family use does not easily lend itself to the current improvement foot-print and floor-plan.
Test 3: the current condition and characteristics of the property do not easily lend itself to conversion to multi family property. The cost of conversion to 2 unit use with the current 1 family layout makes it economically unfeasible to convert. It would not be financial feasible for the other legally permissible uses, as of the effective date of this report. Based on current market conditions, the present use and structure as a single family residence is its financially feasible and maximally productive use.
also, i like this comment, if needed:
Because building codes change from time to time and tend to reflect higher standards and improved technology, an important feature of building codes is that they apply only to new construction and are not applied retroactively to existing buildings. The subject is an existing improvements and per the zoning ordinance does not have to meet the requirements of a new property. The subject was permitted and approved at the time of construction, the use has not changed, therefore the subject is considered to be conforming to the current zoning ordinance per the grandfather clause section of the current zoning ordinance.
Nonconforming Lots:
Minimum R zoning residential lot size in the city is 1,440 Sf. Lower Sf nonconforming lots are common throughout Philadelphia where the typical house predates zoning and maybe situated on a substandard size lot. This has no adverse affect on marketability or value. If the subject were destroyed, the improvement could be rebuilt to its current foot print (subject to city issuance of applicable building permits). Such subject sites were permitted and approved at the time of construction, the use has not changed, therefore the subject is considered to be conforming to the current zoning ordinance per the grandfather clause section of the current zoning ordinance.